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Journal articles on the topic 'Seismic area'
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1
Kamiludin, Udaya, I. Nyoman Astawa, and Moch Akrom Mustafa. "INDIKASI KETERDAPATAN ENDAPAN PLASER PEMBAWA TIMAH DAN UNSUR TANAH JARANG (REE), DI PERAIRAN TODAK, SINGKEP, KEPULAUAN RIAU." JURNAL GEOLOGI KELAUTAN 13, no. 2 (2016): 109. http://dx.doi.org/10.32693/jgk.13.2.2015.266.
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Penelitian geofisika di Perairan Todak, Singkep, Kepulauan Riau menggunakan seperangkat peralatan seismik pantul dangkal saluran tunggal. Tujuan penelitian ini adalah untuk menunjang penelitian keterdapatan endapan plaser pembawa timah dan unsur tanah jarang (REE). Hasil interpretasi rekaman seismik diperoleh terdapatnya lembah/mangkuk yang terbentuk secara alami akibat adanya terobosan batuan granit, di mana lembah/mangkuk-mangkuk ini merupakan tempat terjadinya sedimentasi dari hasil pelapukan batuan di sekitarnya. Hasil interpretasi rekaman seismik pantul saluran tunggal analog di perairan Todak, Singkep, dapat diklasifikasikan menjadi 3 runtunan yaitu runtunan A, B, dan runtunan C.Kata kunci Data seismik, endapan plaser, lembah/mangkuk, Perairan Todak. Geophysical research at Todak, Singkep, Riau Archipelago Province, by using single channel sahllow seismic refletion. The purpose of research is to support placer deposit bearing tin and rare earth element research at this area. From seismic interpretation can be recognized the distribution of valley/bowls which is naturally formed, caused by granite rock intrusion. Those valleys are sedimentation places of wheathered rock from the surrounding area. Beside that, the seismic research also for determining the placer deposit thickness. Interpratation of analog single channel seismic records in the Todak waters, Singkep, result 3 seismic sequences and intrusive feature, A sequences, B, and C. Keywords: Seismic data, placer deposit, valley/basin, Todak Watres.
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Miharno, Fatimah. "ANALISA POTENSI MINYAK DAN GAS BUMI DENGAN ATRIBUT SEISMIK PADA BATUAN KARBONAT LAPANGAN *ZEFARA* CEKUNGAN SUMATRA SELATAN." KURVATEK 1, no. 2 (2017): 21–31. http://dx.doi.org/10.33579/krvtk.v1i2.250.
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ABSTRACT*Zefara* Field formation Baturaja on South Sumatra Basin is a reservoir carbonate and prospective gas. Data used in this research were 3D seismik data, well logs, and geological information. According to geological report known that hidrocarbon traps in research area were limestone lithological layer as stratigraphical trap and faulted anticline as structural trap. The study restricted in effort to make a hydrocarbon accumulation and a potential carbonate reservoir area maps with seismic attribute. All of the data used in this study are 3D seismic data set, well-log data and check-shot data. The result of the analysis are compared to the result derived from log data calculation as a control analysis. Hydrocarbon prospect area generated from seismic attribute and are divided into three compartments. The seismic attribute analysis using RMS amplitude method and instantaneous frequency is very effective to determine hydrocarbon accumulation in *Zefara* field, because low amplitude from Baturaja reservoir. Low amplitude hints low AI, determined high porosity and high hydrocarbon contact (HC). Keyword: Baturaja Formation, RMS amplitude seismic attribute, instantaneous frequency seismic attribute
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Astawa, Nyoman, Priatin Hadi Widjaja, and Wayan Lugra. "POLA SEBARAN GAS CHARGED SEDIMENT DASAR LAUT DI PERAIRAN SIDOARJO JAWA TIMUR." JURNAL GEOLOGI KELAUTAN 9, no. 2 (2016): 65. http://dx.doi.org/10.32693/jgk.9.2.2011.201.
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Gas charged sediment dalam rekaman seismik dicirikan oleh tidak adanya gambar pantul dalam (free reflector), karena gas charged sediment merupakan media penyerap energi. Dari hasil penafsiran rekaman seismik dapat dibuat Peta Pola Sebaran Gas Charged sediment di daerah penelitian. Pola sebaran gas charged sediment di daerah penelitian cukup luas yaitu mulai dari Perairan Sukolilo hingga ke muara Kali Porong. Di bagian selatan daerah penelitian (L-12), sebaran gas charged sediment relatif lebih luas jika dibandingkan dengan di bagian utara (L-19).
 
 Kata kunci : seismik, penafsiran, peta pola sebaran gas charged
 
 
 In the seismic record gas charged is characterized by free reflectors, because the gas charged is an energy absorber media. From the interpretation of the seismic record, the maps of gas charged distribution pattern in the study area can be created. Gas charged distribution pattern in the study area is extend from Sukolilo Waters to the estuary of Porong River. In the soothern part of the study area (L-12), the distribution of gas charged is relatively broader than in the northern part (L-19).
 
 Keywords: seismic, interpretation, map distribution pattern of biogenic gas
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Iswanto, Eko Rudi, Theo Alvin Riyanto, and Hadi Suntoko. "Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat." EKSPLORIUM 42, no. 1 (2021): 39. http://dx.doi.org/10.17146/eksplorium.2021.42.1.6243.
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ABSTRAK Provinsi Nusa Tenggara Barat (NTB) merupakan daerah dengan aktivitas kegempaan yang tinggi. Fenomena ini disebabkan oleh adanya aktivitas tektonik sebagai akibat pertemuan Lempeng Eurasia-Australia (zona subduksi) di bagian selatan dan Sesar Flores di bagian utara serta adanya keberadaan sesar-sesar lokal. Terkait dengan rencana pengembangan kawasan Samota di Pulau Sumbawa, NTB, perlu dilakukan suatu kajian kegempaan. Tujuan penelitian ini adalah memetakan indeks kerentanan seismik (Kg) melalui pengukuran mikrotremor dengan analisis menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR). Hasil penelitian berupa peta kerentanan seismik daerah Plampang yang menunjukkan bahwa sisi utara lokasi penelitian memiliki indeks kerentanan seismik rendah yang ditandai dengan nilai amplifikasi kurang dari tiga jika dibandingkan daerah lainnya. Geologi sisi utara lokasi penelitian tersusun oleh batuan gunung api dengan karakteristik batuan keras, ketebalan sedimen sangat tipis, dan tersusun atas batuan Tersier atau lebih tua. Peta kerentanan seismik berguna sebagai acuan dalam mitigasi gempa bumi untuk mengurangi risiko yang ditimbulkan. ABSTRACT Nusa Tenggara Barat (NTB) Province is an area with intense seismic activity. This phenomenon is caused by tectonic activity as the result of the convergency of the Eurasia-Australia Plates (subduction zone) in the south and the Flores Fault in the north as well as the presence of local faults. Regarding the plan to develop the Samota area in Sumbawa Island, NTB, a study concerning earthquakes should be done. The purpose of this study is to map the seismic vulnerability index (Kg) through microtremor measurement by using the Horizontal to Vertical Spectral Ratio (HVSR) analysis method. The result of the study is a seismic vulnerability map of the Plampang area which its northern part has a low seismic vulnerability index indicated by the amplification factor value of less than three compared to other areas. The geology of the northern part of the Plampang area consists of volcanic rocks which has hard rock characteristic, very thin sediment thickness, and composed of Tertiary or older rocks. Seismic vulnerability maps can be useful as a reference for earthquake mitigation to reduce its risks.
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Drogreshka, Katerina, Dragana Chernih, and Jasmina Najdovska. "SEISMICITY OF DEBAR EPICENTRAL AREA." Knowledge International Journal 28, no. 4 (2018): 1245–50. http://dx.doi.org/10.35120/kij28041245k.
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Main neotectonic regions in the territory of the Republic of Macedonia are the Vardar zone, West Macedonia and East Macedonia. These regions, being developed within major, regional tectonic units, are permanently uplifting with different intensities. They also show differences in the seismic activity, which is the reason to treat them as separate seismic zones, named with the same names. Debar epicentral area belongs to the West Macedonia seismic zone. This epicentral area is presented by the sinking of Drim graben (valley), crisscrossed by neotectonic faults which coused strong earthquake in 1967y, with Richter magnitude ML=6.5 and intensity Io=IX degrees EMS–1998 scale. After 1900y several moderate (5.0≤ML≤5.9) and light (4.0≤ML≤4.9) and lot of small earthquakes with magnitude ML ≤3.9 are also observed. According to all instrumental data, our latest investigation of seismic activity parameters for this epicentral area pointed out the activity of Elbasan-Debar fault.
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Ramanna, C. K., and G. R. Dodagoudar. "Impact Analysis of Seismic Source Area Extent on Hazard Estimate for Chennai City." International Journal of Geotechnical Earthquake Engineering 5, no. 1 (2014): 75–100. http://dx.doi.org/10.4018/ijgee.2014010105.
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The present work is intended to study the effect of variation of seismic area source zone on hazard value for Chennai, India. In the conventional Cornell-McGuire approach to probabilistic seismic hazard analysis, the seismic activity rate for an area source is most often determined using the Gutenberg-Richter (G-R) recurrence law. The seismic area is delineated using geology, geography and/or seismotectonic characteristics of the region. However if the area lies in a distributed seismicity region, the delineation into different area zones introduces subjectivity. The impact of the areal extent of seismic area zone on the final hazard value is studied using two approaches - the conventional Cornell-McGuire and zone-free approaches. It is observed that in the conventional Cornell-McGuire approach, the peak ground acceleration decreases when the area source zone is increased while maintaining all other seismicity parameters same. In the kernel method, the PGA remained unchanged though the seismic source area is increased. This is due to the fact that in the kernel method, the seismic activity rate is a spatially varying parameter unlike the seismic activity rate determined from the G-R recurrence law, which assumes a homogeneous distribution of the activity rate for each of the area source zones. The uniform hazard spectra are obtained for various return periods by both the approaches. It is observed that in the Cornell-McGuire approach, the variation in the extent of seismic source area has little effect on longer return periods as compared to the smaller return periods.
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Rahardiawan, Riza, and Catur Purwanto. "STRUKTUR GEOLOGI LAUT FLORES, NUSA TENGGARA TIMUR." JURNAL GEOLOGI KELAUTAN 12, no. 3 (2016): 153. http://dx.doi.org/10.32693/jgk.12.3.2014.256.
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Tujuan penelitian seismik saluran banyak di Laut Flores, Nusa Tenggara Timur adalah untuk mengetahui kondisi geologi bawah permukaan dasar laut. Daerah penelitian merupakan daerah yang aktif secara tektonik dan diekspresikan dalam bentuk prisma akresi, vulkanik tidak aktif dan sesar-sesar aktif yang membentuk morfologi dasar laut. Berdasarkan penafsiran stratigrafi seismik lapisan bawah permukaan dasar laut terdiri dari empat satuan batuan: Batuan Dasar, Prisma Akresi, Gunungapi Bawah Laut, dan Sedimen Klastika. Sedimen Klastika ini dibagi menjadi lima unit. 
 
 Kata kunci: seismik, morfologi dasar laut, sesar aktif, Laut Flores
 
 
 The purpose of the study of seismic multi channel in Flores Sea, East Nusa Tenggara is to recognize subsurface geology condition. The study area is an active tectonic that expressed by accretion prisms, inactive vulcanic and active faults form seabed morphology. Based on seismic stratigraphy interpretation, the study area is composed of four rocks units: Basement rocks, Accretionary Wedge, Seamount, and Clastic Sediments. This clactic sediment is divided into five units.
 
 Keywords: seismic, seabed morphology, active fault, Flores Sea
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Xie, Zhuo Juan, and Yue Jun Lu. "Determination of the Spatial Distribution Function of Bohai Seismic Tectonic Area." Advanced Materials Research 1065-1069 (December 2014): 1530–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1530.
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The spatial distribution function assigns seismicity parameters of seismic zone and belt to the potential earthquake source area seismic by the magnitude interval, determination of the spatial distribution function is one of the key technologies to comprehensive probabilistic seismic hazard analysis methods, and the results will directly influence seismic hazard analysis results of the calculated sites. However, the spatial distribution functions are hard to get by statistics due to serious lack of seismic samples, and evaluation factors used in the actual work are too complex and not independent, the spatial distribution function is lack of reliability. In this paper, Bohai seismic tectonic area is chosen as an example; geological data are obtained from the newly built offshore oil platform engineering in recent decades, while seismic activity data are obtained by checking from historical difficult seismic parameters. Five factors are adopted in this area, including potential seismic focus area, seismic tectonic, seismic activity level, long-term forecasts, and strong earthquake recurrence interval and construct empty segment. Spatial distribution function of Bohai Sea earthquake structure area is obtained by weighted comprehension; it reflects the spatial and temporal heterogeneity of seismic activities in the area, and provides the calculation parameters for the probabilistic seismic hazard analysis.
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Ju, Mingfeng, and Rongyi Qian. "Practical Application of UAV Source in Complex Area Exploration." Journal of Physics: Conference Series 2651, no. 1 (2023): 012115. http://dx.doi.org/10.1088/1742-6596/2651/1/012115.
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Abstract Unmanned Aerial Vehicle(UAV) source is a new source for shallow seismic exploration. UAV source is based upon the principle of an accelerated weight drop from a high altitude. A 5-kilogram object is carried 500 meters above the surface, controlled by special remote control equipment to free fall at the exact moment we need it, and by hitting the ground at high speed, it generates a powerful amount of seismic waves. Different from traditional seismic sources, such as explosive sources and vibroseis, UAVs are not limited by terrain and it can generate seismic waves in complex environments such as mountains and rivers, with strong flexibility. Meanwhile, it’s impact object is recyclable, so the cost per excitation is minimal. In this paper, Firstly, we analyze the frequency information of the reflected signal in the seismic record obtained by the UAV source in the actual mountainous area, and then discuss the influence of different excitation positions on the record. Finally, we obtain the reflected seismic profile of the region through seismic data processing. It has been proven that UAV source can achieve low-cost and high-quality acquisition in complex environments
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Paramonov, S. S., D. Z. Kappushev, T. A. Manukyan, Kh Yu Evloyev, and E. A. Barseghyan. "Man-made seismicity in the area of the Leninskoye coal deposit." Mining Industry Journal (Gornay Promishlennost), no. 6/2022 (January 15, 2023): 131–36. http://dx.doi.org/10.30686/1609-9192-2022-6-131-136.
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The paper presents an analysis of seismotectonic conditions in the area of the Leninskoye coal deposit (Kuzbass). The territory of the Leninskiy district is belongs to the coverage zone of the Altai-Sayan regional seismic stations network. The results of research into intensification of seismic activity in the Kuzbass region using the local networks of seismic stations are considered. In the course of seismic observations in the territory of the Kemerovo region four seismically active zones been identified that encircle the largest industrial megacities of Kuzbass and that are responsible for 90% of the earthquake foci. According to the distribution of epicenters of the seismic events, the area of the Leninskoe coal deposit belongs to one of the seismic zones with the most actively developing natural and man-made seismic activity identified within the research. The research indicates that the induced seismic activity in Kuzbass prevails over the natural seismicity.
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Woo, Gordon. "Seismic area zones: myth or reality?" Terra Nova 6, no. 5 (1994): 535–36. http://dx.doi.org/10.1111/j.1365-3121.1994.tb00897.x.
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Sari, Anggun Mayang, and Afnindar Fakhrurrozi. "SEISMIC HAZARD MICROZONATION BASED ON PROBABILITY SEISMIC HAZARD ANALYSIS IN BANDUNG BASIN." RISET Geologi dan Pertambangan 30, no. 2 (2020): 215. http://dx.doi.org/10.14203/risetgeotam2020.v30.1138.
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The geological and seismic-tectonic setting in the Bandung Basin area proliferates the seismicity risk. Thus, it is necessary to investigate the seismic hazards caused by the foremost seismic source that affects the ground motions in the bedrock. This research employed Probability Seismic Hazard Analysis (PSHA) method to determine the peak ground acceleration value. It considers the source of the earthquakes in the radius of 500 km with a return period of 2500 years. The analysis results showed that the Peak Ground Acceleration (PGA) in this region varies from 0.46 g to 0.70 g. It correlates with the magnitude and hypocentre of the dominant earthquake source of the study locations. The PGA value on the bedrock was used as an input to develop the seismic hazard microzonation map. It was composed using the Geographic Information System (GIS) to visualise the result. This research provides a scientific foundation for constructing residential buildings and infrastructure, particularly as earthquake loads in the building structure design calculations. ABSTRACT - Mikrozonasi Bahaya Seismik Berdasarkan Probability Seismic Hazard Analysis di Cekungan Bandung. Kondisi geologi dan seismik-tektonik di Cekungan Bandung meningkatkan risiko kegempaan di wilayah tersebut. Oleh karena itu, perlu dilakukan penelitian tentang bahaya seismik yang disebabkan oleh sumber-sumber gempa di sekitarnya yang mempengaruhi gelombang gempa di batuan dasar. Penelitian ini menggunakan metode Probability Seismic Hazard Analysis (PSHA) untuk menentukan nilai percepatan gelombang gempa di batuan dasar. Lebih lanjut penelitian ini menggunakan sumber gempa dalam radius 500 km dengan periode perulangan 2500 tahun. Hasil analisis menunjukkan bahwa Peak Ground Acceleration (PGA) di wilayah ini bervariasi dari 0,46 g hingga 0,70 g. Hal ini berkorelasi dengan magnitudo dan jarak hiposenter sumber gempa dominan terhadap lokasi penelitian. Nilai PGA di batuan dasar digunakan sebagai input data dalam pembuatan peta mikrozonasi bahaya seismik. Peta mikrozonasi bahaya seismik disusun dan divisualisasikan menggunakan Sistem Informasi Geografis (SIG). Luaran penelitian ini menghasilkan landasan ilmiah pada konstruksi bangunan tempat tinggal dan infrastruktur, khususnya sebagai pembebanan gempa dalam perhitungan desain struktur bangunan.
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Kusnida, Dida, and Tommy Naibaho. "LATE NEOGENE SEISMIC STRUCTURES OF THE SOUTH BATANTA BASIN, WEST PAPUA." BULLETIN OF THE MARINE GEOLOGY 29, no. 1 (2016): 11. http://dx.doi.org/10.32693/bomg.29.1.2014.61.
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Study on multi-channel seismic records from South Batanta Basin, West Papua acquired during RV Geomarin III cruise in 2013 were aimed to invent and map geological aspects and for geo-tectonic and geological history studies. Seismic data indicate that sediment sequences which can be observed from our seismic system in the study area are characterized by pre-extension sediments (Lower Early Miocene-Upper Early Pliocene), syn-extension sediments (Lower Middle Pliocene-Upper Late Pliocene), post-extension sediments (Early Pleistocene), and syn-inversion sediments (Late Pleistocene-Recent) typical of the West Papua tectonic system. In the study area, sediment sequences are possibly characterized by clastical sedimentary cover such as slumps, debrites and turbidites. 
 
 Key words: South Batanta Basin, seismic sequence, tectonic, faults, clastical sediments. 
 
 
 Studi rekaman seismik multi kanal dari Cekungan Batanta Selatan, Papua Barat yang diperoleh selama pelayaran KR Geomarin III pada tahun 2013 bertujuan untuk menginventarisir dan memetakan aspek-aspek geologi serta untuk studi geo-tektonik dan sejarah geologi. Data seismik menunjukkan bahwa urutan sedimen yang dapat diamati dari sistem seismik di daerah studi ditandai oleh sedimen pra-ekstensi (Miosen Awal Bagian Bawah-Pliosen Awal Bagian Atas), sedimen syn-ekstensi (Pliosen Tengah Bagian Bawah-Pliosen Akhir Bagian Atas), sedimen post-ekstensi (Plestosen Awal), dan sedimen syn-inversi (Pleistosen Akhir-Resen) tipikal sistem tektonik Papua Barat. Di daerah studi, urutan sedimen dicirikan oleh sedimen penutup klastika kemungkinan berupa slump, debrit dan turbidit. 
 
 Kata kunci: Cekungan Batanta Selatan, sekuen seismik, tektonik, sesar, sedimen klastika.
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Baba Hamed, Fatima Zohra, Driss Djaouad Rahal, and Farid Rahal. "SEISMIC RISK ASSESSMENT OF ALGERIAN BUILDINGS IN URBAN AREA." Journal of Civil Engineering and Management 19, no. 3 (2013): 348–63. http://dx.doi.org/10.3846/13923730.2012.744772.
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The recent earthquakes in Algeria have caused significant human and economic losses. The frequent occurrence of damaging earthquakes clearly demonstrates the urgent need of study on seismic risk assessment methods of buildings to effectively reduce the impact of earthquake in Algerian cities. This article contributes to the development and the application of a seismic risk method, appropriate to Algerian building specificities. This method considers five damage levels, defined accordingly to macroseismic intensity and the seismic quality of the building by means of a vulnerability index. The present paper summarises the development of a tool to integrate seismic hazard and structural information and support the decision making process in identification of seismic risk. This tool could be used in the inspection of buildings and the optimal prioritisation of strengthening and preventives remedial actions that are necessary prior to a major earthquake event.
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Suarez, Gabriela. "Designing 3D seismic surveys in the Macal area using seismic modeling." Leading Edge 23, no. 10 (2004): 1071–76. http://dx.doi.org/10.1190/1.1813361.
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Hinds, Ronald C., Neil L. Anderson, and Richard Kuzmiski. "An integrated surface seismic/seismic profile case study: Simonette area, Alberta." GEOPHYSICS 58, no. 11 (1993): 1676–88. http://dx.doi.org/10.1190/1.1443383.
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On the basis of conventional surface seismic data, the 13–15–63–25W5M exploratory well was drilled into a low‐relief Leduc Formation reef (Devonian Woodbend Group) in the Simonette area, west‐central Alberta, Canada. The well was expected to intersect the crest of the reef and encounter about 50–60 m of pay; unfortunately it was drilled into a flank position and abandoned. The decision to abandon the well, as opposed to whipstocking in the direction of the reef crest, was made after the acquisition and interpretive processing of both near( and far‐offset (252 and 524 m, respectively) vertical seismic profile (VSP) data, and after the reanalysis of existing surface seismic data. The near‐ and far‐offset VSPs were run and interpreted while the drill rig remained on‐site, with the immediate objectives of: (1) determining an accurate tie between the surface seismic data and the subsurface geology; and (2) mapping relief along the top of the reef over a distance of 150 m from the 13–15 well location in the direction of the adjacent productive 16–16 well (with a view to whipstocking). These surveys proved to be cost‐effective in that the operators were able to determine that the crest of the reef was out of the target area, and that whipstocking was not a viable alternative. The use of VSP surveys in this situation allowed the operators to avoid the costs associated with whipstocking, and to feel confident with their decision to abandon the well.
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Pramumijoyo, Subagyo, Myo Thant, and Hiroshi Kawase. "SEISMIC HAZARD MAPPING FOR YOGYAKARTA DEPRESSION AREA, INDONESIA." ASEAN Engineering Journal 1, no. 3 (2011): 57–68. http://dx.doi.org/10.11113/aej.v1.15298.
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The probabilistic seismic hazard maps are developed for Yogyakarta depression area. The earthquake catalog of ANSS (1970-2007) is taken into account. On the basis of seismicity of the area, tectonics and geological information, the seismic source zones are characterized for this area. The seismicity parameters of each seismic source are determined by applying the classical Gutenberg-Richter recurrence model, regarding the historical records. The attenuation relation for Yogyakarta depression area cannot be evaluated since the sufficient strong ground motion records are not available for this region. Therefore the attenuation relations which were developed for other territories as Europe and Japan are used for the present hazard calculation by validating, using the aftershocks records, modeling the peak ground acceleration maps for the recent event, 27 May, 2006, Yogyakarta earthquake inserting the damage area distribution pattern. The probabilistic seismic hazard maps are finally developed by using EQRISK computer program by modifying for the present purpose. The seismic hazard maps expressed in term of peak ground acceleration (PGA) are developed for the recurrence intervals of 10, 50, 100, 200 and 500 years.
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Weichert, Dieter. "Seismic acceleration zones in the Vancouver area." Canadian Journal of Civil Engineering 21, no. 2 (1994): 351–53. http://dx.doi.org/10.1139/l94-035.
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Since 1990, an increased number of locations for the Lower Mainland of British Columbia has been listed in the Table of Climatic Data in the Supplements to the National Building Code of Canada. While for most of the new locations the seismic acceleration and velocity zones are shown as Za = Zv = 4, Ladner is listed with Za = 5, leading to significant cost increase in the construction of certain types of buildings. Although the zonal value is formally correct, it is suggested that such discrimination is not justified by the current precision of seismic hazard estimation.The Canadian National Committee on Earthquake Engineering does not address regional variances of this nature; it is, therefore, further suggested that a regional committee should decide on an equitable solution, with due consideration of estimated probabilities of exceeding ground motion parameters, and the precision of these estimates. Some of the background and details aiding such a decision are discussed. Key words: seismic hazard, acceleration, seismic zones, earthquake design, Vancouver acceleration.
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Zhang, Hang, Xie Dong Zhang, and Jin Tian Wang. "Analysis of Viscous Dampers for Continuous Bridge in Meizoseismal Area." Applied Mechanics and Materials 353-356 (August 2013): 2149–52. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2149.
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Continuous bridges jolted the public attention into the awareness of the seismic vulnerability due to its wide application in bridge engineering. Viscous dampers can effectively improve the seismic performance of continuous bridge. In this paper, taking the Yellow River Bridge located in seismic region with intensity VIII as an example, the influence of the damping coefficient and velocity exponent of the damper on seismic responses of the bridge are carried out in detail. The applicable model parameters are also presented.
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Aydin, Ali, Erdal Akyol, Mahmud Gungor, Nuray Soyatik, and Suat Tasdelen. "Seismic Microzonation for Denizli Metropolitan Area, Turkey." Applied Mechanics and Materials 802 (October 2015): 40–44. http://dx.doi.org/10.4028/www.scientific.net/amm.802.40.
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This study presents microzonation of the Denizli city center, is about 225 km2. It is mainly rely on t seismic velocities of the tested soil. For seismic microzonation area of has been selected as the study area. Seismic refraction methods have been used to generate two-dimensional profiles at 310 locations. These p and s wave velocities are used to estimate boundaries of the velocities at every 2 and 5 m intervals up to a depth of 60 m. The results are satisfactory for urban planning and it can successfully be used in urban areas. The municipal authority may be considered to use the results for land use studies.
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Liu, Cheng Bin, Ya Ling Ou, Xing Chen Dong, et al. "Study on the Seismic Performance of Rural Buildings in Beijing Area." Applied Mechanics and Materials 353-356 (August 2013): 2397–401. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2397.
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Wenchuan earthquake caused huge losses in rural areas. The subject briefly introduced the earthquake damage characteristics of masonry structures, analyzed the earthquake damage reasons. The main purpose is to propose some measures to improve the seismic capacity of rural buildings in Beijing area. Through two seismic fortification measures, can effectively enhance the integrity of the masonry structure, reduce the seismic response, effectively improve the seismic capacity of the structure.
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Zhang, Guanlong, Peng Xiang, Jinduo Wang, et al. "Geologic modeling study of foothill area of the Junggar Basin rim." Interpretation 6, no. 4 (2018): SM19—SM26. http://dx.doi.org/10.1190/int-2018-0003.1.
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The varied terrain and complex subsurface structure in the foothill segment of fold and thrust belts results in low-quality seismic data. Therefore, a structural model built only on the basis of seismic will have low reliability and be nonunique. To solve these problems, we have developed a comprehensive modeling method for foothill zones that combines gravity, magnetic (MT), electric, and seismic data. Information from gravity, MT, electric, and seismic data is fully used in each step of modeling. This reduces the nonuniqueness and guarantees the rationality and reliability of the tectonic model. The core of this procedure is simultaneous joint inversing gravity, MT, electric, and seismic multiparameters, which improves the accuracy of velocity model and results in a higher quality of seismic image. The Hala’alate Mountain area in the Junggar Basin, western China, is chosen as the application place, and the process of modeling is evaluated in detail; the structural model is proven to be correct by drilling data. Our method is more accurate and reliable than methods only using seismic data to build a geologic model in foothill zones.
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Zheng, Y., and W. D. Wang. "Research on the Source Parameters and Scaling Relations of Earthquakes in Qinba Mountain and Its Adjacent Area." Journal of Physics: Conference Series 2895, no. 1 (2024): 012026. https://doi.org/10.1088/1742-6596/2895/1/012026.
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Abstract In this paper, the source parameters were determined for 123 small to moderate size earthquakes (1.2 ≤ ML ≤ 4.5) occurred during 1997-2013 in Qinba Mountain and its adjacent area by using the digital seismic data recorded in Shaanxi seismic network. The scaling relations between seismic moment, stress drop, seismic radiated energy with seismic magnitude are determined, the relations between scaled energy Eg/M0 and seismic moment are analyzed. The results show that the seismic stress drop in this area approximately increases with the increase of seismic moment, but the seismic stress drop is generally low. The Zúñiga parameter ε is generally less than 1, indicating partial stress drop mechanism in the region and may be the activity of low strength mature faults. The seismic scaled energy in this area is relatively small, which may be the results of high dynamic friction force or insufficient estimation of seismic radiation energy.
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Wang, Ruijuan. "Seismic Data Acquisition Technology in Loess Mountainous Area of Ordos and Southern Jiangsu." Scientific Research Bulletin 1, no. 3 (2024): 15–18. https://doi.org/10.71052/srb2024/vyno9901.
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The surface of the loess mountain area in southern Ordos is covered by a thick loess layer, and the seismic exploration process has poor excitation and reception effects of seismic waves, and the reflection energy of seismic waves in the target horizon is weak, and the quality of collected data is poor. According to the principle that high water saturation and good lithology of loess layer will be beneficial to seismic wave excitation, through the investigation of water saturation and lithology of loess layer in the study area, the best seismic wave excitation horizon and depth are determined, and the best single well excitation dose is determined according to practical experience. In the aspect of seismic wave receiving and recording, the basic flow of survey line layout is worked out, and the seismic wave acquisition scheme suitable for the study area is finally worked out by combining the seismic wave receiving scheme with small path distance, large offset distance and high coverage times.
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Alyeshina, E. A., L. I. Karpenko, S. V. Kurtkin, V. V. Atrokhin, and J. V. Gabdrakhmanova. "Seismic zoning of the Teutejak ore field area (Magadan region)." Russian Journal of Seismology 5, no. 1 (2023): 60–74. http://dx.doi.org/10.35540/2686-7907.2023.1.04.
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Earthquakes’ nature was studied and detailed seismic zoning and seismic micro-zoning were carried out for the Teutejak ore field area (Magadan region), considering geological, geophysical and seismological data. Detailed seismic zoning was based on tectonic zoning maps of Magadan region and seismological monitoring data in the vicinity the Teutejak ore field area, carried out by MB GS RAS. 10 source zones and 8 faults generating earthquakes were identified. Hypocenters of potential maximum earthquakes were determined. They are associated with the largest deep faults (Khurensky and Chelomdzha-Yamsky) and can cause ground shake in the area of main structures. According to the results of the JSR, the initial (background) seismicity in the area of the ore field for objects with an increased level of responsiveness is 9 points, the magnitude of the most dangerous earthquake according to calculations will be MS = 7.5. The initial seismicity for objects with a normal level of responsibility is 8 points, the magnitude of the most dangerous earthquake will be MS = 6.8. The obtained results of the detailed seismic zoning were the initial estimates of seismic impacts for seismic micro-zoning. The initial seismicity for objects with a normal level of responsibility is 8 points, the magnitude of the most dangerous earthquake will be MS = 6.8. The calculated increment of the score and the calculated intensity of the seismic impact on the 10 areas, characterized by different engineering and geological conditions of the soils of the upper part of the section, both the method of direct registration of earthquakes and explosions, and the method of acoustic stiffness were used. The research results are shown on detailed seismic zoning map.
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Wang, Zhenming, David T. Butler, Edward W. Woolery, and Lanmin Wang. "Seismic Hazard Assessment for the Tianshui Urban Area, Gansu Province, China." International Journal of Geophysics 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/461863.
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A scenario seismic hazard analysis was performed for the city of Tianshui. The scenario hazard analysis utilized the best available geologic and seismological information as well as composite source model (i.e., ground motion simulation) to derive ground motion hazards in terms of acceleration time histories, peak values (e.g., peak ground acceleration and peak ground velocity), and response spectra. This study confirms that Tianshui is facing significant seismic hazard, and certain mitigation measures, such as better seismic design for buildings and other structures, should be developed and implemented. This study shows that PGA of 0.3 g (equivalent to Chinese intensity VIII) should be considered for seismic design of general building and PGA of 0.4 g (equivalent to Chinese intensity IX) for seismic design of critical facility in Tianshui.
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Ghimire, Sunita. "Probabilistic seismic hazard analysis of Nepal." Journal of Innovations in Engineering Education 2, no. 1 (2019): 199–206. http://dx.doi.org/10.3126/jiee.v2i1.36676.
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Probabilistic seismic hazard analysis for Nepal has been carried out considering uniform density model. A detailed earthquake catalogue since 1255 A.D, within the rectangular area has been developed and historical earthquakes are plotted in the map of Nepal. Five hundred twenty eight numbers of areal sources are used within the study area to characterize the seismic sources. The completeness of the data has been checked by using Stepp's procedure. Seismicity in four regions of study area has been evaluated by defining 'a' and 'b' parameters of Gutenberg Richter recurrence relationship. Seismic hazard curve of Nepal for soft subsoil condition for 10% probability of exceedence in 50 years period i.e. for return period of 475 years has been plotted.
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Oh, HyunJu, JunSung Lee, and HyungChoon Park. "Microzonation of Sejong City Area Based on Site Amplification Generated by Pohang-Type Seismic Waves." Journal of the Korean Society of Hazard Mitigation 22, no. 6 (2022): 263–71. http://dx.doi.org/10.9798/kosham.2022.22.6.263.
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When an earthquake occurs, the behavior of the ground is significantly influenced by the seismic wave characteristics (waveform) and soil layer conditions. In local and international seismic design standards, it is recommended that the input seismic wave should correspond to the design response spectrum and reflect the fault characteristics. In this study, ground response analysis was performed to satisfy the seismic design standards using modified design seismic waves generated by the Pohang seismic waves measured at the bedrock location. The peak ground acceleration, ground amplification ratio, and natural period of Sejong-si for Pohang-type seismic waves were determined using the Sejong-si 120 site exploration results. From a plotted risk map, a map of floors that could experience relatively large seismic loads during an earthquake was determined. Based on the risk map plotted in this study, it is possible to prepare for earthquake damage in advance by identifying the degree of seismic damage to a structure when an earthquake occurs and selecting the building inspection or seismic reinforcement priority.
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Karakaisis, G. F., C. B. Papazachos, and E. M. Scordilis. "SEISMIC SOURCES AND MAIN SEISMIC FAULTS IN THE AEGEAN AND SURROUNDING AREA." Bulletin of the Geological Society of Greece 43, no. 4 (2017): 2026. http://dx.doi.org/10.12681/bgsg.11393.
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A seismic source is defined, in the present work, as the part of the seismogenic layer of theearth’s crust with a circular horizontal dimension (E, R), where E is the epicenter of the largestearthquake (mainshock) ever occurred in this seismic source and radius equal to the half faultlength of this largest earthquake (R=L/2). In addition to foreshocks and aftershocks othersmaller mainshocks occur in other smaller faults of this source or in parts of the main fault.All available historical and instrumental data concerning strong (M³6.0) shallow (h≤60 km) andintermediate depth (60km<h≤100km) shocks which occurred in the Aegean area between 464B.C. and 2008 are used in the present work in an attempt to identify the seismic sources in thisarea, as well as to determine the basic parameters of the largest fault in each source. A particularprocedure is followed to identify 155 seismic sources in this area and determine thebasic parameters of the largest fault in each source. Declustering has been also performed todefine mainshocks in the Aegean area and the completeness of this mainshock catalogue hasbeen determined. Results are summarized in table (1).
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Senatorski, Piotr. "Effect of seismic moment–area scaling on apparent stress–seismic moment relationship." Physics of the Earth and Planetary Interiors 196-197 (April 2012): 14–22. http://dx.doi.org/10.1016/j.pepi.2012.02.001.
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Zhao, Chongxu, Lunqiang Yao, Shichao Hou, Yantao Zhu, Hao Gu, and Bo Li. "Seismic finite element analysis of tailings dam in high seismic intensity area." IOP Conference Series: Earth and Environmental Science 525 (July 7, 2020): 012057. http://dx.doi.org/10.1088/1755-1315/525/1/012057.
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Chen, Lin Jie, and Bo Liang. "Analysis of Anti-Seismic Fortified Length of Tunnel Portal in High Seismic Intensity Area." Applied Mechanics and Materials 90-93 (September 2011): 2057–61. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2057.
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In high seismic intensity area, strong seismic motion may cause the ruin of highway tunnel, especially the tunnel portal which is the weak links for anti-seismic fortifying. Based on soil-structure interaction model, 3D seismic responses of tunnel portal, in combination with the Menglian tunnel engineering on the Bao-Teng Highway in Yunnan, were performed by using viscous-spring artificial boundary and time history analysis method. The anti-seismic fortified length of tunnel portal to the effects of dynamic and crack property was studied. The results show that the acceleration of lining gradually decreases with the lining extends to the tunnel body under the high-intensity seismic load. Along the axial direction of the tunnel, the crack from the portal 50m is not obvious. The results provide references for the tunnel anti-seismic design．
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Jamaluddin, Jamaluddin, Johanes Gedo Sea, Fitriani Fitriani, and Maria Maria. "PENGOLAHAN DATA SEISMIK 2D MARINE MENGGUNAKAN ProMAX DI AREA TENGGARA PULAU SIMEULUE." PETROGAS: Journal of Energy and Technology 2, no. 2 (2020): 26–43. http://dx.doi.org/10.58267/petrogas.v2i2.42.
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Multiple in marine seismic data is the noise formed due to the high impedance contrast at the boundary between layer. Multiple interferes the data processing that will also affect the interpretation of subsurface image. The use of seismic reflection in ocean has become an activity that is often performed with a variety of purposes, to map the subsurface. The basic objective of seismic data processing is to convert the recorded information from the field into data that can be interpreted. One goal of seismic data processing is to eliminate or reduce the noise of reverberation and multiples as well as enhance the signal to noise ratio. The data are a 2D marine reflection seismic data with SEG-Y format that will be processed with using ProMAX software. SEG-Y data are combined with field geometry data in processing of header load, then is carried out noise reduction (trace editing and filtering), and seismic signal amplification (deconvolution and TAR).
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Li, Jipeng, Xin Li, Lijing Wang, Shan Sun, and Shuyu Wang. "Application of seismic attribute analysis in Ordovician reservoir prediction in Hechuan Tongnan exploration area, Sichuan Basin." Journal of Physics: Conference Series 2834, no. 1 (2024): 012205. http://dx.doi.org/10.1088/1742-6596/2834/1/012205.
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Abstract Exploration has revealed that the Ordovician in Sichuan Basin has good conditions for oil and gas accumulation in the peripheral areas of the paleo-uplift, but it is difficult to predict the carbonate reservoirs due to their strong heterogeneity and complex planar distribution. Based on seismic, drilling, logging and analysis data, this paper makes full use of 3D seismic data from the Hechuan Tongnan exploration area to study the relationship between petrophysical parameters and geophysics parameters, the seismic response characteristics of carbonate reservoir are determined by forward modeling. On the basis of detailed interpretation, several seismic attributes with high correlation coefficients with reservoir response characteristics in this area were selected and seismic attribute reservoir prediction research was carried out in the Hechuan Tongnan exploration area, Sichuan Basin Province, through correlation intersection analysis of seismic attributes and intersection analysis of seismic attributes and well-point porosity, the optimal seismic attributes for reservoir prediction are optimized, and the reservoir distribution is characterized, it provides an important basis for risk exploration in this area.
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Zhou, Qi, and Wen Long Ding. "Seismic Reservoir Prediction in Lengjia-Leijia Area." Applied Mechanics and Materials 318 (May 2013): 428–31. http://dx.doi.org/10.4028/www.scientific.net/amm.318.428.
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Through the deep exploration in Lengjia-Leijia area, four reservoirs were found: the lower sub-section of the third member of Shahejie formation, the fourth member of Shahejie formation, Mesozoic, and Archean. The fourth member of Shahejie formation and the layer below it had fewer drilling reach; its reservoir stratums are different. Seismic reservoir prediction has become the major means of oil-gas reservoir evaluation. The logging-constrained inversion method was applied in this study. A geologic model was established based on the detailed interpretation of seismic data; then, inversion and prediction were performed to describe and evaluate the distribution, thickness, and physical characteristics of the reservoirs. The results showed that the reservoir in the fourth member of Shahejie formation, Mesozoic, and Archean are well developed, and that oil-gas accumulation is in good condition. Therefore, the deep layer in this area is an important exploration direction. This study also provided the preliminary prediction that a favorable trap area exists.
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Li, Changlong, and Mengtan Gao. "Seismic Hazard Model Harmonization in Tienshan Area." Journal of Risk Analysis and Crisis Response 9, no. 2 (2019): 74. http://dx.doi.org/10.2991/jracr.k.190703.003.
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Zaharia, Bogdan, Bogdan Grecu, Andreea Tolea, and Mircea Radulian. "Seismic Observations in Bucharest Area with a Raspberry Shake Citizen Science Network." Applied Sciences 13, no. 9 (2023): 5646. http://dx.doi.org/10.3390/app13095646.
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Technological advancements and the appearance of low-cost Raspberry Shake seismographs have enabled the development of citizen science seismic networks in many areas worldwide. These networks can help reduce seismic risk and increase citizens’ understanding of seismology and earthquakes. Such a network exists in Bucharest, one of the cities in Europe that are struck and affected by strong Vrancea earthquakes. The paper aims to show that data from such networks can be used in both outreach programs and research studies. There are presented, for the first time, seismic observations collected over two years beginning in the summer of 2020 in the Bucharest area based on the low-cost seismometers from the citizen science Raspberry Shake network. A significant number of earthquakes from the Vrancea region were recorded by the Bucharest Raspberry Shake Seismic Network (BRSSN). Some of them were felt by Bucharest inhabitants. The National Institute for Earth Physics in Magurele (Romania) organizes educational events that promote geosciences among the population and presents the tools at its disposal for a better understanding of earthquakes and their effects, contributing this way to the development of the concept of citizen science. Citizens are the first witnesses to seismic events and the citizen science seismic network provides them with the first direct information about the event via web apps available for any internet-connected device. Their involvement as non-professional participants helps in providing data for scientists via questionnaire forms to improve scientific research for earthquake assessment. Since citizen seismometers are installed in urban areas, an analysis of the ambient seismic noise (ASN) was performed in addition to the analysis of recorded seismic events. The analysis indicates that the level of seismic noise is mainly controlled by human activities. At the same time, for one citizen seismometer installed in a school in Bucharest, the results show patterns of noise variations due to students’ activity.
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Hakimov, Farkhod, Gisela Domej, Anatoly Ischuk, Klaus Reicherter, Lena Cauchie, and Hans-Balder Havenith. "Site Amplification Analysis of Dushanbe City Area, Tajikistan to Support Seismic Microzonation." Geosciences 11, no. 4 (2021): 154. http://dx.doi.org/10.3390/geosciences11040154.
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Being a country exposed to strong seismicity, the estimation of seismic hazard in Tajikistan is essential for urbanized areas, such as the rapidly growing capital city Dushanbe. To ensure people’s safety and adequate construction work, a detailed seismic microzonation is the key to proper hazard planning. Existing estimations of seismic hazard date back to 1978; they are based on engineering geological investigations and observed macroseismic data. Thereupon relies the Tajik Building Code, which considers seismic intensities according to the Medvedev–Sponheuer–Karnik Scale, MSK-64. However, this code does not accurately account for soil types, which vary considerably in Dushanbe—not only by their nature, but also due to increasing anthropogenic influences. In this study, we performed a series of analyses based on microtremor array measurements, seismic refraction tomography, and instrumental data recording from permanent stations for standard spectral ration and from mobile seismic stations for the horizontal to vertical spectral ratio in order to provide a comprehensive full-cover microzonation of Dushanbe accounting for soil types. Our results identify several critical areas where major damage is likely to occur during strong earthquakes.
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ΠΑΠΑΔΟΠΟΥΛΟΣ, Τ. Δ., Ι. ΑΛΕΞΟΠΟΥΛΟΣ, Π. ΚΑΜΠΟΥΡΗΣ, Σ. ΤΟΛΗΣ, and Σ. ΚΑΒΟΥΝΙΔΗΣ. "Contribution of modern seismic methods for subsurface investigations. An applicaton at Kalogreza area (Athens)." Bulletin of the Geological Society of Greece 34, no. 4 (2001): 1317. http://dx.doi.org/10.12681/bgsg.17220.
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In this paper the application of the seismic tomography method for subsurface investigation, especially in the case of adit detection at depths between 30 and 80 meters is presented. The use of non destructive seismic sources as the mechanical hammer as well as seismic detonators were allowed seismic waves of dominant frequency between 200Έ250 Hz to be recorded. After the processing of seismic records and the subtraction of seismic noise by applying appropriate filters, the technique of non linear inversion was elaborated by using the advanced algorithm of J. Zhang and N. Toksoz (1998). This technique was applied in three borehole pairs that were drilled in the Kalogreza area. According to the obtained results there were no large subsurface adits detected. A small differentiation in seismic velocity (of the order of 300 m/s) near boreholes Bl-1 (mainly) and Bl-3, is due either to phasies change or to different physical condition of the material.
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Sandoli, Antonio, Claudio D’Ambra, Carla Ceraldi, Bruno Calderoni, and Andrea Prota. "Sustainable Cross-Laminated Timber Structures in a Seismic Area: Overview and Future Trends." Applied Sciences 11, no. 5 (2021): 2078. http://dx.doi.org/10.3390/app11052078.
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Cross-laminated timber (CLT) buildings are recognized as a robust alternative to heavyweight constructions, because beneficial for seismic resistance and environmental sustainability, more than other construction materials. The lightness of material and the satisfactory dissipative response of the mechanical connections provide an excellent seismic response to multi-story CLT buildings, in spite of permanent damage to timber panels in the connection zones. Basically, CLT constructions are highly sustainable structures from extraction of raw material, to manufacturing process, up to usage, disposal and recycling. With respect to other constructions, the potential of CLT buildings is that their environmental sustainability in the phases of disposal and/or recycling can be further enhanced if the seismic damage in structural timber components is reduced or nullified. This paper reports a state-of-the art overview on seismic performance and sustainability aspects of CLT buildings in seismic prone regions. Technological issues and modelling approaches for traditional CLT buildings currently proposed in literature are discussed, focusing the attention on some research advancements and future trends devoted to enhance seismic performance and environmental sustainability of CLT buildings in seismic prone regions.
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ogli Ahmadov, Tofig Rashid. "Design of a combined cube of seismic data acquired in areas of complicated relief by use of various seismic source types." E3S Web of Conferences 411 (2023): 01050. http://dx.doi.org/10.1051/e3sconf/202341101050.
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The paper gives brief information on the study area with attention focused mainly on complex surface seismic and geological environment, stipulating the use of 3D seismic survey in this area. As the area features complicated relief, the sources and receivers have been chosen individually for each location of the survey. Seismic energy sources generated various seismic oscillations and this complicated the design of combined 3D cube for the whole study area. By use of modeling we have reduced all oscillations to the minimal-phased form. The next stage of processing consisted in use of shifts of time sections for combination of seismic boundaries acquired for various parts of the area: onshore, offshore, swampy areas. Thus, applying the standard procedures it was possible to design combined 3D cube.
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Decanini, Luis, Giacomo Di Pasquale, Paolo Galli, Fabrizio Mollaioli, and Tito Sanò. "Seismic Hazard and Seismic Zonation of the Region Affected by the 2002 Molise, Italy, Earthquake." Earthquake Spectra 20, no. 1_suppl (2004): 131–65. http://dx.doi.org/10.1193/1.1771012.
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In 1998, a new system of seismic classification promoted by the Department of Civil Protection identified the area in Italy hit by the 2002 earthquake in Molise and Puglia as a Zone 2 (moderately seismic). However, this classification was not adopted until March 2003, when an ordinance passed that partially closed the gap between scientific knowledge and official recognition of seismic hazard and that established a method for constantly updating the classification in the future. This paper reviews some of the methods available to assess the seismic hazard, particularly referring to the rich seismic history of Italy and using the “Associated Seismic Area” concept. This study confirms that the area affected by this earthquake should be considered as Zone 2. An appendix presents data on the seismic risk of existing buildings in the area and concludes that it is high for masonry buildings and that a strengthening program is needed.
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Al Karadaghi, Salar S. Hasan. "Exploratory Seismic Geophysical Study of the Khanuqah Structure Area." Journal of Petroleum Research and Studies 12, no. 1(Suppl.) (2022): 35–53. http://dx.doi.org/10.52716/jprs.v12i1(suppl.).619.
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Khanuqah structure area carried as the geophysics exploration study of Jeribe Formation target, the area located in the north of Iraq within Salah Aldeen Governorate, has been used geophysical data represented by 2D seismic lines were executed as exploratory surveys of 27 seismic lines, the data interpretations used by Petrel software (version 2018) based on the required aims, which are determined to achieve an update the structural model in Jeribe Fn. as a gas reservoir.The results show the Khanaqah structure includes five domes, the general direction of the structure axis is northwest-southeast, a gradient of its slope from the northwest structurally higher to the southwestern part structurally lower, the southeastern part of the study area is an open basin that increases the level of depth lines relative to the mentioned part.Seismic sections showed at the locations of structural domes the phenomenon of inter-spacing of seismic reflectors as tuning phenomena in reservoirs within Jeribe Fn. reservoir which is a direct index of the gas presence. To ensure tracking of extensions phenomena as a director for a gas presence, the seismic interpretations used a new technique by convert 2D seismic lines to 3D seismic cube through the reflections specifications publication of the khanaqah area, that shows the concerning of gaseous presence in the Khanaouqa-1 well and its disappearance in the Khanaouqa-2 well, it indicates the relationship between the location of the two wells at the structure, since Khanaouqa-1 well is structurally shallower than the Khanaouqa-2 well, which means that the well of Khanaouqa-2 is outside the scope of the gas patch, this was confirmed by the 3D seismic cube derived that showed the phenomenon presence on the site of Khanoqa-1 and did not appear in Khanoqa-2.Due to the importance of developing the Khanuqah structure as a worthy gas field, the research recommended drilling an exploratory well at the location of dome- B, whose coordinated in the study area penetrating the Euphrates Fn. bearing in mind that Khanuqa-1 did not locate on the center site of the domes nor on the center site of the direct phenomenon as evidence of the gas existence.
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Cui, Jiawei, Ailan Che, Sheng Li, and Yongfeng Cheng. "Evaluation method on seismic risk of substation in strong earthquake area." PLOS ONE 16, no. 12 (2021): e0258792. http://dx.doi.org/10.1371/journal.pone.0258792.
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Frequent earthquakes in strong earthquake areas pose a great threat to the safety operation of electric power facilities. There exists a pressing research need to develop an assessment method for the seismic risk of substations, i.e., the hubs of power system networks. In this study, based on Incremental Dynamic Analysis (IDA), Probabilistic Seismic Demand Model (PSDM) and reliability theory, a vulnerability model for a substation is obtained, based on considering the relationships between Peak Ground Acceleration (PGA) and four seismic damage states (complete, extensive, moderate, and slight.) via a probabilistic approach. After an earthquake, the scope of influence and PGA distribution are evaluated using information recorded by the seismic observation stations, based on using interpolation or an empirical formula for the PGA attenuation. Therefore, the seismic risk can be evaluated by combining ground motion evaluation and the pre-built vulnerability model. The Wuqia- Kashgar area of Xinjiang was selected as the study area; it is an Earthquake-prone area, and one of the starting points for new energy transmission projects in China. Under a hypothetical earthquake (MS 7.9), the seismic risk of the substations was evaluated. The results show that: this method is able to give the probabilities of the four damage states of the substations, four substations close to the epicenter only have a probability of slight damage (45%-88%) and other substations are safer.
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AHMADOV, Tofik, and Amikishi ASADLİ. "IMPROVING THE VISUALIZATION OF THE GEOLOGICAL STRUCTURE OF THE HOVSAN AREA, AZERBAIJAN USING VSP." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 1 (108) (2025): 61–66. https://doi.org/10.17721/1728-2713.108.08.
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Background. Increasing the resolution (both vertical and horizontal) of land and borehole seismic exploration is an urgent task facing geophysicists. There are various ways to increase the resolution of seismic studies, among which inelastic absorption takes a special place. This method has not been widely used compared to other methods (for example, distribution of the total charge of explosives over smaller ones, i.e., grouping of sources, inverse filtering - deconvolution, etc.) due to the limited amount of information about inelastic absorption and the difficulty of determining it or the quality factor of the environment. Important information for determining the quality factor of the medium and inelastic absorption is provided by borehole seismic exploration, in particular, VSP (vertical seismic profiling). The recent VSP at well N 1856 of the Govsan area made it possible to determine the inelastic absorption of the medium from well observations and thereby restore the weakened higher frequency components of the seismic wave field, which made it possible to quite significantly change the observed wave pattern on time sections, enriching it with high frequency components and thereby increasing the resolution of surface as well as borehole seismic data. This research aims to improve the vertical resolution of land and borehole seismic exploration using vertical seismic profiling data on inelastic absorption of the geological medium. Methods. Based on the VSP data, the effective quality factor Q parameter was determined. For this purpose, the entire recorded VSP interval was divided into 4 parts. Results. The entire recorded VSP interval was divided into four parts: the full interval (~324–4500 m measured depth) for determining the effective quality factor Q, and three sub-intervals – upper (~324–1887 m), middle (~1803–3799 m), and lower (~3814–4500 m) – for calculating interval values of the quality factor. After determining Q for each interval, the average effective quality factor Q=145 was obtained and applied to restore attenuated frequencies on seismic time sections and the vertical component Z of the VSP profile. A comparison of the original and processed seismic time sections after Q=145 filtering shows significant improvements in resolution. The restoration of high-frequency components in seismic records has notably enhanced the clarity of both surface seismic and VSP time sections. The results confirm that applying VSP-derived quality factor parameters can be highly effective in land seismic data processing. Conclusions. The application of Q-filtering with an effective quality factor of Q=145 has significantly improved the resolution of both surface seismic and VSP time sections. The results demonstrate the effectiveness of utilizing certain VSP parameters in land seismic processing. Additionally, restoring attenuated high-frequency components enhances data clarity and interpretability. The use of the quality factor can be integrated at different processing stages, with its optimal application determined experimentally to achieve the best results.
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Vamvakaris, D. A., C. B. Papazachos, Ch A. Papaioannou, E. M. Scordilis, and G. F. Karakaisis. "A detailed seismic zonation model for shallow earthquakes in the broader Aegean area." Natural Hazards and Earth System Sciences 16, no. 1 (2016): 55–84. http://dx.doi.org/10.5194/nhess-16-55-2016.
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Abstract. In the present work we propose a new seismic zonation model of area type sources for the broader Aegean area, which can be readily used for seismic hazard assessment. The definition of this model is based not only on seismicity information but incorporates all available seismotectonic and neotectonic information for the study area, in an attempt to define zones which show not only a rather homogeneous seismicity release but also exhibit similar active faulting characteristics. For this reason, all available seismological information such as fault plane solutions and the corresponding kinematic axes have been incorporated in the analysis, as well as information about active tectonics, such as seismic and active faults. Moreover, various morphotectonic features (e.g. relief, coastline) were also considered. Finally, a revised seismic catalogue is employed and earthquake epicentres since historical times (550 BC–2008) are employed, in order to define areas of common seismotectonic characteristics, that could constitute a discrete seismic zone. A new revised model of 113 earthquake seismic zones of shallow earthquakes for the broader Aegean area is finally proposed. Using the proposed zonation model, a detailed study is performed for the catalogue completeness for the recent instrumental period.Using the defined completeness information, seismicity parameters (such as G–R values) for the 113 new seismic zones have been calculated, and their spatial distribution was also examined. The spatial variation of the obtained b values shows an excellent correlation with the geotectonic setting in the area, in good agreement with previous studies. Moreover, a quantitative estimation of seismicity is performed in terms of the mean return period, Tm, of large (M ≥ 6.0) earthquakes, as well as the most frequent maximum magnitude, Mt, for a typical time period (T = 50 yr), revealing significant spatial variations of seismicity levels within the study area. The new proposed seismic zonation model and its parameters can be readily employed for seismic hazard assessment for the broader Aegean area.
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Vamvakaris, D. A., C. B. Papazachos, C. Papaioannou, E. M. Scordilis, and G. F. Karakaisis. "A detailed seismic zonation model for shallow earthquakes in the broader Aegean area." Natural Hazards and Earth System Sciences Discussions 1, no. 6 (2013): 6719–84. http://dx.doi.org/10.5194/nhessd-1-6719-2013.
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Abstract. In the present work we present an effort to define a new seismic zonation model of area type sources for the broader Aegean area, which can be readily used for seismic hazard assessment. The definition of this model is based not only on seismicity information but incorporates all available seismotectonic and neotectonic information available for the study area, in an attempt to define zones which show not only a rather homogeneous seismicity release but also exhibit similar active faulting characteristics. For this reason, all available seismological information such as fault plane solutions and the corresponding kinematic axes have been incorporated in the analysis, as well as information about active tectonics, such as seismic and active faults. Moreover, various morphotectonic features (e.g. relief, coastline) were also considered. Finally, a revised seismic catalogue is employed and earthquake epicentres since historical times (550 BC–2008) are considered, in order to define areas of common seismotectonic characteristics, that could constitute a discrete seismic zone. A new revised model of 113 earthquake seismic zones of shallow earthquakes for the broader Aegean area is finally proposed. Using the proposed zonation model, a detailed study is performed for the catalogue completeness for the recent instrumental period. Using the defined completeness information, seismicity parameters (such as G–R values) for the 113 new seismic zones have been calculated, and their spatial distribution was also examined. The spatial variation of the obtained b values shows an excellent correlation with the geotectonic setting in the area, in good agreement with previous studies. Moreover, a quantitative estimation of seismicity is performed in terms of the mean return period, Tm, of large (M ≥ 6.0) earthquakes, as well as the most frequent maximum magnitude, Mt, for a typical time period (T = 50 yr), revealing significant spatial variations of seismicity levels within the study area. The new proposed seismic zonation model and its parameters can be readily employed for seismic hazard assessment for the broader Aegean area.
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Timotius, Hagayudha, and Yulinar Firdaus. "QUALITY IMPROVEMENT OF SEISMIC IMAGE FROM 2D PSDM (PRE STACK DEPTH MIGRATION) USING TOMOGRAPHY FOR INTERVAL VELOCITY MODEL REFINEMENT." BULLETIN OF THE MARINE GEOLOGY 28, no. 2 (2016): 43. http://dx.doi.org/10.32693/bomg.28.2.2013.59.
Full textAbstract:
The main goal of seismic exploration is to get an accurate image of subsurface section so it can be easily interpreted. Pre Stack Depth Migration (PSDM) is such a powerful imaging tool especially for complex area such an area where strong lateral velocity variations exist. The main challenge of PSDM is the need of accurate interval velocity model.In this research, Dix Transformation, coherency inversion, and tomography are used for initial interval velocity model, and then tomography is used for interval velocity model refinement. We compare also between seismic image resulted from PSDM and PSTM to determine the best method. The seismic data that processed in this paper is derived from north western part of Australian Waters.
 
 Kata kunci: Pre Stack Depth Migration, Dix Transformation, coherency inversion, tomography. 
 
 
 Tujuan utama dari eksplorasi seismik adalah menghasilkan citra yang akurat dari penampang bawah permukaan sehingga diinterpretasi lebih mudah. Pre Stack Depth Migration (PSDM) merupakan suatu metode yang memberikan hasil peningkatan kualitas citra seismik pada daerah kompleks dimana terjadi variasi kecepatan lateral yang signifikan. Salah satu syarat penting yang harus dipenuhi agar hasil PSDM lebih optimal adalah model kecepatan interval yang akurat. Dalam penelitian ini Transformasi Dix, inversi koheren, dan tomografi digunakan untuk memenuhi syarat tersebut. Perbandingan hasil penampang seimik PSDM dan PSTM dilakukan untuk menentukan metode terbaik. Data seismik yang diolah dalam tulisan ini berasal dari wilayah Perairan Baratlaut Australia. 
 
 Kata kunci: Pre Stack Depth Migration, Transformasi Dix, inversi koheren, tomografi
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Angove, Ron. "THE POINT TORMENT SEISMIC SURVEY: A SEMI-PORTABLE SEISMIC OPERATION." APPEA Journal 25, no. 1 (1985): 248. http://dx.doi.org/10.1071/aj84021.
Full textAbstract:
Point Torment, an area of low-lying tidal mudflats and adjacent coastal peninsula, was the site of a seismic survey unique to Australian geophysical exploration. This survey was conducted by Esso Australia Ltd and the area, part of EP 104, is located north of the township of Derby in Western Australia.Surface conditions in the area varied from thickly wooded grassland on the peninsula to open mudflats. Vehicle access to the mudflats was severely restricted and helicopter support was necessary to maintain the seismic operation throughout. The operation was extremely labour intensive; for example, line-cutting through mangrove areas was carried out by hand.Seismic recording was achieved using an OPSEIS* 5500 digital radio telemetry system. With this system data is collected by portable field units labelled Remote Telemetry Units (RTU's) and subsequently retrieved by Radio telemetry and permanently stored on magnetic tape by a Central Recording Station (CRS). This was the first instance of this system being employed in Australia.
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Stewart, Robert R. "Integrated seismic analysis: Kidney area, northern Alberta, Canada." GEOPHYSICS 54, no. 10 (1989): 1240–48. http://dx.doi.org/10.1190/1.1442583.
Full textAbstract:
Integrating various seismic data via simultaneous processing or correlation can increase the accuracy and confidence in subsurface images. To this end, a multioffset VSP survey with simultaneous surface recording was acquired in the fall of 1986 near Red Earth, northern Alberta, in the Kidney prospect area. P‐wave vibrators at three locations west of the survey well were recorded by a downhole three‐component geophone at 15 m increments between depths of 225 m and 1570 m and were recorded simultaneously on a 2900 m surface spread of vertical geophones spaced 25 m apart in line with the VSP sources and just west of the well. These data, along with existing seismic lines and well logs, correlated convincingly and were used to increase confidence in the interpretation of the potential reservoir of interest—a Keg River carbonate (KRC) unit. Tomographic procedures (constrained traveltime inversion) were developed to process simultaneously the well logs, VSP, and surface seismic data. These procedures provided a macroscopic seismic interval velocity in depth. This tomographic velocity structure (TVS) was used in poststack depth migration of an existing seismic line over the region of interest. The resulting depth‐migrated section near the well matched the synthetic seismogram (computed in depth from the sonic log) reasonably well in character and depth for most of the major reflectors. The TVS was also used in a fairly conventional processing flow which included poststack time migration, maximum‐likelihood deconvolution, seismic trace inversion, and time‐to‐depth stretching. The final processed pseudosonic section in depth bore considerable resemblance to the sonic log. About 30 m of KRC was measured from the pseudosonic section, while 35 m of KRC was interpreted from the well logs. The pseudosonic section also strongly suggested thinning or discontinuity in the KRC unit on the section around a previously proposed drilling location (1.7 km west of the well). This interpretation was confirmed by another operator’s subsequent drilling at this location, which encountered only 1 m of KRC. The predicted depth of the KRC top (about 1395 m), interpreted from the pseudosonic section at the second well location, was close to the depth (1400 m) on the well logs.