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Journal articles on the topic 'Seismic cycles'

Author: Grafiati

Published: 23 November 2024

Last updated: 31 July 2025

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1

Cui, Fengkun, Linlin Song, Xingyu Wang, et al. "Seismic Fragility Analysis of the Aging RC Columns under the Combined Action of Freeze–Thaw Cycles and Chloride-Induced Corrosion." Buildings 12, no. 12 (2022): 2223. http://dx.doi.org/10.3390/buildings12122223.

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The combined action of freeze–thaw cycles and chloride-induced corrosion are generally recognized as one of the main causes of the degradation of the mechanical properties and seismic performance of reinforced concrete (RC) structures in the northern frozen coastal regions. To investigate the degradation mechanisms of the seismic performance of RC columns subjected to the combined action of freeze–thaw cycles and chloride-induced corrosion, the impact of freeze–thaw cycles on the chloride diffusion coefficient of concrete was studied through concrete deterioration tests and theoretical analysi

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2

Cui, Fengkun, Guangzhu Guan, Long Cui, Mian Li, Shuwen Deng, and Huihui Li. "Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage." Buildings 13, no. 1 (2023): 126. http://dx.doi.org/10.3390/buildings13010126.

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Freeze–thaw damage is one of the primary causes deteriorating the seismic resistance of reinforced concrete (RC) structures. This paper proposed a freeze–thaw damage deterioration model for C30 concrete, and it can be employed to study the time-varying seismic performance of aging RC columns. Next, this study developed a seismic fragility analysis framework for deteriorating RC columns considering the effect of freeze–thaw damage. Considering the geometric parameters of the case-study bridge, the deterioration characteristics of material, and the uncertainties involved in structural modeling a

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3

Muratalieva, Zhazgul, and Aiymjan Omuralieva. "Monitoring the dynamics of seismicity within the Kemin-Chilik zone, generating M≥8 earthquakes." Russian Journal of Seismology 2, no. 4 (2020): 51–62. http://dx.doi.org/10.35540/2686-7907.2020.4.05.

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The dynamics of seismic processes at the junction of the Tien Shan mountain building area and the Kazakh shield is presented in the paper. It is noted that the Tien Shan’s lithosphere over thrusts the Kazakh Shield’s lithosphere, and the Kazakh Shield’s lithosphere under thrusts beneath the Tien Shan’s lithosphere based on the seismic tomographic and seismotectonic data. Low-velocity heterogeneity is distinguished at the junction of these lithospheres, under where a low-velocity anomaly flow is assumed in the mantle. Marginal (active structures of the Ili basin, Zaili mountain range), and midd

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4

Malhotra, Praveen K., Paul E. Senseny, Antonio C. Braga, and Roger L. Allard. "Testing Sprinkler-Pipe Seismic-Brace Components." Earthquake Spectra 19, no. 1 (2003): 87–109. http://dx.doi.org/10.1193/1.1543160.

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The design codes and standards (e.g., UBC, IBC, NFPA-13) estimate the amplitude of the seismic load in sprinkler-pipe braces, but they do not specify the number of cycles for which this load must be resisted by various components of pipe braces. Because the components can fail in low-cycle fatigue, the number of load cycles must be considered in establishing the strength of the brace components. The first part of this study deals with determining the number of cycles for which a component must resist its rated capacity. Strong-motion records from 18 strongly shaken buildings were incorporated

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5

Wu, Jieqiong, Jian Zhang, Bo Diao, Shaohong Cheng, and Yinghua Ye. "Hysteretic Behavior of Eccentrically Loaded Reinforced Air-Entrained Concrete Columns under Combined Effects of Freeze-Thaw Cycles and Seawater Corrosion." Advances in Civil Engineering 2018 (July 19, 2018): 1–10. http://dx.doi.org/10.1155/2018/3931791.

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Besides service loads, reinforced concrete structures in cold coastal seismic regions are subjected to multiple attacks of freeze-thaw cycles and seawater corrosion as well as the earthquake struck. An experimental study was conducted to investigate the seismic response of eccentrically loaded reinforced air-entrained concrete columns under alternative actions of freeze-thaw cycles and chloride corrosion. Results show that, after 300 times of freeze-thaw cycles alternated with 100 times of seawater immersion, the hysteretic behavior of the eccentrically loaded columns manifested an apparent as

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6

Viete, Daniel R., Bradley R. Hacker, Mark B. Allen, et al. "Metamorphic records of multiple seismic cycles during subduction." Science Advances 4, no. 3 (2018): eaaq0234. http://dx.doi.org/10.1126/sciadv.aaq0234.

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7

Gandelli, Emanuele, Dario De Domenico, and Virginio Quaglini. "Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation." Bulletin of Earthquake Engineering 19, no. 12 (2021): 5219–51. http://dx.doi.org/10.1007/s10518-021-01156-3.

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AbstractHysteretic steel dampers have been effectively used to improve the seismic performance of framed buildings by confining the dissipation of seismic energy into sacrifical, replaceable devices which are not part of the gravity framing system. The number of cycles sustained by the dampers during the earthquake is a primary design parameter, since it can be associated to low-cycle fatigue, with ensuing degradation of the mechanical properties and potential failure of the system. Current standards, like e.g. the European code EN 15129, indeed prescribe, for the initial qualification and the

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8

Wang, Fred P., Jiachun Dai, and Charles Kerans. "Modeling dolomitized carbonate‐ramp reservoirs: A case study of the Seminole San Andres unit—Part II, Seismic modeling, reservoir geostatistics, and reservoir simulation." GEOPHYSICS 63, no. 6 (1998): 1876–84. http://dx.doi.org/10.1190/1.1444480.

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In part I of this paper, we discussed the rock‐fabric/petrophysical classes for dolomitized carbonate‐ramp rocks, the effects of rock fabric and pore type on petrophysical properties, petrophysical models for analyzing wireline logs, the critical scales for defining geologic framework, and 3-D geologic modeling. Part II focuses on geophysical and engineering characterizations, including seismic modeling, reservoir geostatistics, stochastic modeling, and reservoir simulation. Synthetic seismograms of 30 to 200 Hz were generated to study the level of seismic resolution required to capture the hi

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9

Kwiatek, Grzegorz, T. H. W. Goebel, and Georg Dresen. "Seismic moment tensor andbvalue variations over successive seismic cycles in laboratory stick-slip experiments." Geophysical Research Letters 41, no. 16 (2014): 5838–46. http://dx.doi.org/10.1002/2014gl060159.

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10

Omurbek kyzy, Kanyshai, and Mederbek Omuraliev. "Seismic monitoring of explosions in the Central site of the Kumtor deposit, Tien Shan." Russian Journal of Seismology 2, no. 4 (2020): 83–99. http://dx.doi.org/10.35540/2686-7907.2020.4.08.

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Seismic monitoring of explosions was carried out at the local area of the Central site of the Kumtor deposit for January 2017 - January 2018. Velocities of seismic longitudinal and transverse waves, their ratios (VP, VS, VP/VS), maximum amplitudes and their ratios (AP, AS, AS/AP) were studied, and average values with standard deviation values were determined, and hierarchies of cycles are distinguished in their variations in time. It is noted that the ratios of VP, VS, VP/VS reflect the state of the crust medium, small values of VP, VS, VP/VS express possible manifestation of fluids, and large

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11

Zhang, Yixin, Shansuo Zheng, Xianliang Rong, Liguo Dong, and Hao Zheng. "Seismic Performance of Reinforced Concrete Short Columns Subjected to Freeze–Thaw Cycles." Applied Sciences 9, no. 13 (2019): 2708. http://dx.doi.org/10.3390/app9132708.

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Previous research shows that freeze–thaw cycles represent one of the most dangerous threats to reinforced concrete (RC) structures. However, there is almost no experimental data on the effects of freeze–thaw cycles on the seismic behavior of RC columns showing flexure-shear failure. In this study, three columns with the shear span-to-depth ratio of 2.5 were subjected to different numbers of freeze–thaw cycles (FTCs) and pseudo-static testing. The seismic performance indexes of the specimens were analyzed in terms of hysteretic behavior, skeleton curves, shear deformation, and energy dissipatio

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12

Meng, Fan Chao, Xiao Ming Yuan, and Hui Xue. "Effect of Loading Amplitude on Soil Deformation under Irregular Waves and Fixed-Number Waves." Applied Mechanics and Materials 256-259 (December 2012): 2015–18. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.2015.

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Through series of dynamic triaxial tests, the relationships of soil deformations under irregular seismic loading and fixed-number constant amplitude loading are analyzed. The effect of loading amplitudes on the relationships is presented. The results shows: (1) soil deformation under irregular seismic loading obviously differs from that under constant amplitude sinusoidal loading, and the strain history is mainly controlled by the performance of ground motion; (2) if 20 cycles of constant amplitude loading is employed instead of irregular seismic loading to correct residual deformation under r

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13

Zheng, Shan Suo, Bin Wang, Lei Li, Wei Wang, and Jin Chuan He. "Component Seismic Damage Model for SRHSHPC Joints." Key Engineering Materials 417-418 (October 2009): 705–8. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.705.

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The deficiency of present damage model is generalized by studying existing references. The mechanical properties of steel reinforced high strength and high performance concrete (SRHSHPC) members under monotonic loading, including the capacity of ultimate deformation, strength, stiffness, etc. are analyzed after the different number of cycles. The reduction factor is introduced, the dynamic variation relationship of ultimate deformation with the number of cycles is obtained, and the merits of existing damage model are utilized, finally the seismic damage model, which is suitable for SRHSHPC bea

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14

Rosenau, Matthias, Fabio Corbi, and Stephane Dominguez. "Analogue earthquakes and seismic cycles: experimental modelling across timescales." Solid Earth 8, no. 3 (2017): 597–635. http://dx.doi.org/10.5194/se-8-597-2017.

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Abstract. Earth deformation is a multi-scale process ranging from seconds (seismic deformation) to millions of years (tectonic deformation). Bridging short- and long-term deformation and developing seismotectonic models has been a challenge in experimental tectonics for more than a century. Since the formulation of Reid's elastic rebound theory 100 years ago, laboratory mechanical models combining frictional and elastic elements have been used to study the dynamics of earthquakes. In the last decade, with the advent of high-resolution monitoring techniques and new rock analogue materials, labo

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15

Kato, Naoyuki. "Simulation of seismic cycles of buried intersecting reverse faults." Journal of Geophysical Research: Solid Earth 106, B3 (2001): 4221–32. http://dx.doi.org/10.1029/2000jb900417.

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16

Xu, Jingling, Luofu Liu, Guiwen Wang, Changchun Zou, and Jin Lai. "Study of sedimentary sequence cycles by well-seismic calibration." Petroleum Science 10, no. 1 (2013): 65–72. http://dx.doi.org/10.1007/s12182-013-0251-z.

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17

Di Cesare, Antonio, Felice Carlo Ponzo, Nicla Lamarucciola, and Domenico Nigro. "Dynamic Seismic Response of Nonlinear Displacement Dependent Devices versus Testing Required by Codes: Experimental Case Studies." Applied Sciences 10, no. 24 (2020): 8857. http://dx.doi.org/10.3390/app10248857.

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Passive energy dissipation systems are one of the most resilient solutions to mitigate the seismic risk of structures. In case of strong motions, they can confine the eventual damages into easily replaceable anti-seismic devices. The performance characteristics of nonlinear displacement dependent devices (NLD) shall be defined by the force-displacement cyclic behavior, as well as the expected number of cycles related to both the duration of the earthquake and to the fundamental frequency of the structural systems. The aims of this paper are the comparison between the dynamic results of two dif

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18

Carpinteri, Alberto, and Gianni Niccolini. "Correlation between the Fluctuations in Worldwide Seismicity and Atmospheric Carbon Pollution." Sci 1, no. 1 (2018): 2. http://dx.doi.org/10.3390/sci1010002.

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The crucial stages in the geochemical evolution of the Earth’s crust, ocean, and atmosphere could be explained by the assumed low-energy nuclear reactions (LENR) that are triggered by seismic activity. LENR result in the fission of medium-weight elements accompanied by neutron emissions, involving Fe and Ni as starting elements, and C, N, O as resultants. Geochemical data and experimental evidences support the LENR hypothesis. A spectral analysis of the period 1955-2013 shows common cycles between interannual changes in atmospheric CO2 growth rate and global seismic-moment release, whereas the

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19

Carpinteri, Alberto, and Gianni Niccolini. "Correlation between the Fluctuations in Worldwide Seismicity and Atmospheric Carbon Pollution." Sci 1, no. 1 (2019): 2. http://dx.doi.org/10.3390/sci1010002.v2.

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The crucial stages in the geochemical evolution of the Earth’s crust, ocean, and atmosphere could be explained by the assumed low-energy nuclear reactions (LENR) that are triggered by seismic activity. LENR result in the fission of medium-weight elements accompanied by neutron emissions, involving Fe and Ni as starting elements, and C, N, O as resultants. Geochemical data and experimental evidences support the LENR hypothesis. A spectral analysis of the period 1955-2013 shows common cycles between interannual changes in atmospheric CO2 growth rate and global seismic-moment release, whereas the

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20

Carpinteri, Alberto, and Gianni Niccolini. "Correlation between the Fluctuations in Worldwide Seismicity and Atmospheric Carbon Pollution." Sci 1, no. 1 (2019): 17. http://dx.doi.org/10.3390/sci1010017.

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The crucial stages in the geochemical evolution of the Earth’s crust, ocean, and atmosphere could be explained by the assumed low-energy nuclear reactions (LENR) that are triggered by seismic activity. LENR result in the fission of medium-weight elements accompanied by neutron emissions, involving Fe and Ni as starting elements, and C, N, O as resultants. Geochemical data and experimental evidences support the LENR hypothesis. A spectral analysis of the period 1955-2013 shows common cycles between interannual changes in atmospheric CO2 growth rate and global seismic-moment release, whereas the

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21

Gheibi, Emad, and Mohammad Hosein Bagheripour. "Effect of Parameters on Equivalent Number of Cycles Using ‎Nonlinear Seismic Site Response Analysis." Advanced Materials Research 255-260 (May 2011): 2365–69. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2365.

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The concept of equivalent number of uniform stress cycles, is essential for assessment of soil liquefaction potential. In this regard, various procedures are used to convert random acceleration time history to uniform cycles having amplitude of 0.65 of peak acceleration. Equivalent number of cycles (Neq) defines equivalent energy generated by harmonic loading as that imposed by irregular motion during an earthquake. Neq is assumed to be a function of earthquake magnitude. Over the past years, in accordance with development in methods of soil liquefaction evaluation, various methods have been p

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22

Adeishvili, Teimuraz, Aleksandar Aleksandrov, and Magdana Jikia. "ON SEISMICSENSITIVITY OF BIOSYSTEMS AND COSMIC CYCLE PERTURBATION." Journal Scientific and Applied Research 6, no. 1 (2014): 44–47. http://dx.doi.org/10.46687/jsar.v6i1.139.

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The paper discusses the connections of the occurrences in biosphere with the cosmic seismic activity and cosmic cycles, namely, with the interposition of the sun and the planets. Some relation patterns between the changes of the radon concentration in thermal-mineral waters, the physiological events occurring in and biosystem and cosmic biorhythms have been revealed.

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23

Kishida, Tadahiro, and Chi-Chin Tsai. "Seismic Demand of the Liquefaction Potential with Equivalent Number of Cycles for Probabilistic Seismic Hazard Analysis." Journal of Geotechnical and Geoenvironmental Engineering 140, no. 3 (2014): 04013023. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001033.

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24

Guo, Feng, Changshuan Ji, Shenghua Lai, and Lei Zhang. "A method of establishing high-resolution isochronous stratigraphic framework in 3D seismic data volume." Stratigraphy 20, no. 2 (2023): 143–54. http://dx.doi.org/10.29041/strat.20.2.04.

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The establishment of a high-frequency sequence stratigraphic framework (short-term cycles) is the basis of seismic sedimentology research, which provides a new way to establish a high-resolution isochronous stratigraphic framework using 3D-seismic data. The linear interpolation between reference seismic reflections is used to establish a high-resolution isochronous stratigraphic framework (stratal slices). By carefully calibrating time-depth relationships, a corresponding relationship between short-term cycle (high-frequency cycle) interfaces and stratal slices is created. Five reference seism

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25

Xu, Shanhua, Anbang Li, Zengyang Ji, and Yan Wang. "Seismic performance of reinforced concrete columns after freeze–thaw cycles." Construction and Building Materials 102 (January 2016): 861–71. http://dx.doi.org/10.1016/j.conbuildmat.2015.10.168.

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26

Noël, Corentin, Cédric Twardzik, Pierre Dublanchet, and François Passelègue. "On the emergence of fault afterslip during laboratory seismic cycles." Earth and Planetary Science Letters 658 (May 2025): 119288. https://doi.org/10.1016/j.epsl.2025.119288.

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27

Santos, A. R. G., T. L. Campante, W. J. Chaplin, et al. "Seismic signatures of magnetic activity in solar-type stars observed by Kepler." Proceedings of the International Astronomical Union 13, S340 (2018): 225–28. http://dx.doi.org/10.1017/s1743921318001229.

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AbstractThe properties of the acoustic modes are sensitive to magnetic activity. The unprecedented long-term Kepler photometry, thus, allows stellar magnetic cycles to be studied through asteroseismology. We search for signatures of magnetic cycles in the seismic data of Kepler solar-type stars. We find evidence for periodic variations in the acoustic properties of about half of the 87 analysed stars. In these proceedings, we highlight the results obtained for two such stars, namely KIC 8006161 and KIC 5184732.

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Martinez, Fernando J., Michael L. Batzle, and André Revil. "Influence of temperature on seismic velocities and complex conductivity of heavy oil-bearing sands." GEOPHYSICS 77, no. 3 (2012): WA19—WA34. http://dx.doi.org/10.1190/geo2011-0433.1.

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The joint inversion of seismic and electromagnetic data can be of great use to monitor the steam-assisted production of heavy oils in field conditions. Seismic velocity and complex conductivity laboratory measurements were performed on three heavy oil-bearing sands at confining and pore pressures similar to field conditions. One of the samples (8H) was initially oil-wet and the two other samples (5P-3A and P-1A) were initially water-wet. Low-frequency stress-strain measurements and complex conductivity measurements were performed during two heating cycles (at constant temperature, 10°C steps i

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29

Lobkovsky, Leopold I., Irina S. Vladimirova, Yurii V. Gabsatarov, and Dmitry A. Alekseev. "Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone." Geosciences 12, no. 3 (2022): 107. http://dx.doi.org/10.3390/geosciences12030107.

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We discussed the peculiarities of the seismic cycle in Aleutian subduction zone, characterized by an oblique subduction setting. It was shown that the orientation of the plate convergence vector relative to the subduction zone axis can have a significant impact on the preparation and occurrence of the largest earthquakes in subduction zones. In particular, from the analysis of the seismic activity occurring in the western part of the Aleutian island arc, it was found that the seismic cycles here are shorter than in the eastern part of the arc. It was revealed that the strongest earthquakes, re

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30

Kulak, Goeffrey L., D. J. L. Kennedy, Robert G. Driver, and Manoj Medhekar. "Steel Plate Shear Walls—An Overview." Engineering Journal 38, no. 1 (2001): 50–62. http://dx.doi.org/10.62913/engj.v38i1.748.

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Steel plate shear walls are an innovative lateral loadresisting system capable of effectively bracing a building against both wind and earthquake forces. The system consists of vertical steel infill plates one story high and one bay wide connected to the surrounding beams and columns. The plates are installed in one or more bays for the full height of a building to form a stiff cantilever wall. North American practice is to use unstiffened plates. Steel plate shear walls are well-suited for new construction, and they offer a relatively simple means for the seismic upgrading of existing steel o

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31

Teng, Fei, Yueying Zhang, Weidong Yan, Xiaolei Wang, and Yanfeng Li. "Numerical Simulation of Reinforced Concrete Piers after Seawater Freeze–Thaw Cycles." Coatings 12, no. 12 (2022): 1825. http://dx.doi.org/10.3390/coatings12121825.

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The reinforced concrete (RC) piers of offshore bridges inevitably experience seawater freeze–thaw cycles due to the periodic movement of tides in cold climates. The damage caused by seawater freeze–thaw cycles will reduce the durability and mechanical properties of concrete, and then affect the seismic performance of RC piers. The method of seismic performance analysis on RC piers by numerical simulation is gradually emerging because the process of the conventional experiment is relatively complicated, and the heterogeneity and degradation of concrete after seawater freeze–thaw cycles should b

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Xu, C., J. Geoffrey Chase, and Geoffrey W. Rodgers. "Nonlinear Regression Based Health Monitoring of Hysteretic Structures under Seismic Excitation." Shock and Vibration 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/193136.

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This paper presents a health monitoring method using measured hysteretic responses. Acceleration and infrequently measured displacement are integrated using a multirate Kalman filtering method to generate restoring force-displacement hysteresis loops. A linear/nonlinear regression analysis based two-step method is proposed to identify nonlinear system parameters. First, hysteresis loops are divided into loading/unloading half cycles. Multiple linear regression analysis is applied to separate linear and nonlinear half cycles. Preyielding stiffness and viscous damping coefficient are obtained in

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Sheridan, Mattilda, D. Rhodri Johns, Howard D. Johnson, and Sandra Menpes. "The stratigraphic architecture, distribution and hydrocarbon potential of the organic-rich Kyalla and Velkerri shales of the Upper Roper Group (McArthur Basin)." APPEA Journal 58, no. 2 (2018): 858. http://dx.doi.org/10.1071/aj17224.

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Recent exploration studies on the stratigraphic framework, depositional environment and tectonic setting of the Mesoproterozoic Roper Group in the McArthur Basin, have led to an improved understanding of the highly prospective organic-rich shales of the Velkerri and Kyalla Formations. From a review of open-file drill core and well logs, several major regressive–transgressive (R–T) cycles have been identified along with four key facies associations within the Roper Group. The R–T cycles show sedimentary features typical of deposition within a clastic-dominated marine deltaic setting and show ma

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Pavel, Florin, and Robert Vladut. "Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models." Infrastructures 8, no. 9 (2023): 133. http://dx.doi.org/10.3390/infrastructures8090133.

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This paper is focused on the evaluation of the liquefaction hazard for different sites in Romania. To this aim, a database of 139 ground motions recorded during Vrancea intermediate-depth earthquakes having moment magnitudes MW ≥ 6.0 is employed for the evaluation of the equivalent number of cycles for this seismic source. Several functional forms for the empirical evaluation of the equivalent number of cycles considering various seismological or engineering parameters are tested and evaluated. The regression analysis shows smaller uncertainties for the empirical models based on ground motion

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Telesca, Luciano, Anh Tuan Thai, Dinh Trong Cao, Dinh Trieu Cao, Quoc Van Dinh, and Xuan Bach Mai. "Fractal and Spectral Analysis of Seismicity in the Lai Chau Area (Vietnam)." Fractal and Fractional 7, no. 11 (2023): 776. http://dx.doi.org/10.3390/fractalfract7110776.

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The time dynamics of the instrumental seismicity recorded in the area of the Lai Chau reservoir (Vietnam) between 2015 and 2021 were analyzed in this study. The Gutenberg–Richter analysis of the frequency–magnitude distribution has revealed that the seismic catalog is complete for events with magnitudes larger or equal to 0.6. The fractal method of the Allan Factor applied to the series of the occurrence times suggests that the seismic series is characterized by time-clustering behavior with rather large degrees of clustering, as indicated by the value of the fractal exponent α≈0.55. The time-

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Cao, Chen, Shan-suo Zheng, Wei-bing Hu, Li-guo Dong, and Xiao-rui Liu. "Seismic Behavior of Reinforced Concrete Frame Joints in Coastal Atmosphere." Advances in Civil Engineering 2020 (March 10, 2020): 1–15. http://dx.doi.org/10.1155/2020/1636539.

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The study aims to research the influence of salt fog corrosion cycles on seismic performance of reinforced concrete (RC) frame beam-column joints in coastal atmosphere. Based on low cyclic loading tests of six RC frame beam-column joint specimens, this study analyses the failure patterns, hysteresis loops, load carrying capacity, displacement, backbone curves, and energy dissipation capacity of corrosion-damaged RC frame beam-column joints. The effect of salt fog corrosion cycles and axial compression ratios are tested repeatedly. The results show that with the same level of axial compression

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van Andel, Tjeerd H., Eberhard Zangger, and Constantine Perissoratis. "Quaternary Transgressive/Regressive Cycles in the Gulf of Argos, Greece." Quaternary Research 34, no. 3 (1990): 317–29. http://dx.doi.org/10.1016/0033-5894(90)90044-l.

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AbstractBorings in the Argive Plain reveal cycles of marine incursions, each ending with a Mediterranean soil profile and followed by a prograded fluvial and coastal wedge. The sediment prism of the Gulf of Argos shelf, visible in high-resolution seismic reflection profiles, also consists of transgressive and regressive depositional sequences identified by onlap, downlap, and truncation of deposits. At least four major reflectors, recognizable by their high acoustic impedance and erosional features, can be correlated across the shelf. The sediments between each pair of reflectors represent the

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Negulescu, Caterina, Kushan K. Wijesundara, and Evelyne Foerster. "Seismic Damage Assessment of Regular Gravity Design Buildings." Key Engineering Materials 569-570 (July 2013): 294–301. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.294.

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During the past earthquakes, different low ductile failure modes are observed in the gravity design structures and thus, the most of existing damage indices may fail to assess the damage of gravity design structures accurately in referring to the two main performance levels: immediate occupancy and ultimate limit state. Therefore, this study investigates the possible damage indices for the damage assessment of gravity design frames. For this purpose, among the existing damage indices in the literature, this study considers the inter-story drift and the natural period based damage indices. In a

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Abdullah, Wrya, Seyed Sasan Khedmatgozar Dolati, and Arjun Basnet. "Inelastic Cyclic Tests of Grade 80 (550 MPa) Bars with Mechanical Splices." Journal of Studies in Civil Engineering 1, no. 1 (2024): 1–14. http://dx.doi.org/10.53898/jsce2024111.

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This study addresses low-cycle fatigue performance of high-strength steel reinforcement bars (HSRB) when used with mechanical couplers due to the growing demand for higher-strength steel reinforcement bars in both seismic and non-seismic applications, driven by the need to reduce bar congestion, lower material quantities, and consider economic and environmental factors. Low-cycle fatigue involves material failure owing to a finite number of load or deformation cycles, generally occurring under substantial strain rates that surpasses the yielding limit. The experimental program assesses the fat

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PAZ, J. D. S., and D. F. ROSSETTI. "Linking lacustrine cycles with syn-sedimentary tectonic episodes: an example from the Codó Formation (late Aptian), northeastern Brazil." Geological Magazine 142, no. 3 (2005): 269–85. http://dx.doi.org/10.1017/s0016756805000488.

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The Codó Formation exposed in the eastern Grajaú Basin, northeastern Brazil, consists mostly of black shales, limestones and evaporites arranged into several shallowing-upward cycles formed by progradation of lake deposits. Three ranks of cycles are distinguished. The lower-rank cycles correspond to millimetric interbeddings of: bituminous black shales with evaporites, calcimudstones or peloidal wackestone–packstone; grey/green shale with calcimudstone, peloidal wackestone–packstone or ostracodal wackestone/grainstone; and ostracodal wackestone/grainstone and/or calcimudstones with cryptomicro

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Li, Fan Xiu. "Five-Element Connection Number Method for Seismic Damage Evaluation on RC Structure." Advanced Materials Research 255-260 (May 2011): 2461–65. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2461.

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In view of the problem that seismic damage evaluation for reinforced concrete structure are difficult to quantify, a new model for seismic damage evaluation was established by five-element connection number based on set pair analysis in the paper, which took internal damage index, maximum inter-storey drift, number of inelastic cycles and energy-concentrated quotient as evaluation factors. All indexes can be summarized into five-element connection number. Four different types of structure are analyzed on the model with more satisfactory results. Compared with the matter-element analysis evalua

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Maia, Renata Moreira da Costa, Antonio Tadeu dos Reis, Eliane da Costa Alves, et al. "Architecture and stratigraphic framework of shelf sedimentary systems off Rio de Janeiro state, Northern Santos Basin-Brazil." Brazilian Journal of Oceanography 58, spe1 (2010): 15–29. http://dx.doi.org/10.1590/s1679-87592010000500003.

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Seismic analysis of sparker lines of GEOMAR cruises allowed us to address a first stratigraphic scenario for the shallow sedimentary record (~300 msec) of the continental shelf off Rio de Janeiro State, northern Santos basin. Two sets of seismic sequences were identified and interpreted as a succession of depositional sequences induced by repeated glacioeustatic cycles. Depositional sequences composing Set I (SqA-SqC) are dominantly sigmoidal, reflecting periods of increasing accommodation space that favoured the preservation of both aggradational and progradational units; sequences of Set II

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Donaire-Ávila, Jesús, and David Galé-Lamuela. "Energy Capacity of Waffle-Flat-Plate Structures with Hysteretic Dampers Subjected to Bidirectional Seismic Loadings." Applied Sciences 10, no. 9 (2020): 3133. http://dx.doi.org/10.3390/app10093133.

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This study investigates the capacity, in terms of energy, of waffle-flat-plate (WFP) structures with hysteretic dampers subjected to biaxial seismic actions. A numerical model was developed and calibrated with the experimental results obtained from shake-table testing carried out on a WFP specimen subjected to biaxial seismic loads. Then the WFP system was retrofitted with hysteretic dampers—slit-plate dampers (SPDs)—and the numerical model was subjected to different sets of ordinary ground motion records to attain different seismic performance levels (SPLs). Each set of records was applied in

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Zhao, Yumin, Yunyue Elita Li, Enhedelihai Nilot, and Gang Fang. "Urban Running Activity Detected Using a Seismic Sensor during COVID-19 Pandemic." Seismological Research Letters 93, no. 1 (2021): 181–92. http://dx.doi.org/10.1785/0220210147.

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Abstract Human foot traffic in urban environments provides essential information for city planners to manage the urban resources and urban residents to plan their activities. Compared to camera or mobile-based solutions, seismic sensors detect human footstep signals with fewer privacy concerns. However, seismic sensors often record signals generated from multiple sources, particularly in an urban outdoor environment. In this article, we monitor people’s running activities during COVID-19 pandemic with a seismic sensor in a park in Singapore. We compare the spectra of natural and urban events i

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Kim, Ki-Beom, and Heon-Young Chang. "Relations between global seismic parameters and activity cycles of the Sun." New Astronomy 92 (April 2022): 101720. http://dx.doi.org/10.1016/j.newast.2021.101720.

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McGuire, J. J. "Seismic Cycles and Earthquake Predictability on East Pacific Rise Transform Faults." Bulletin of the Seismological Society of America 98, no. 3 (2008): 1067–84. http://dx.doi.org/10.1785/0120070154.

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Niu, Lihua, Shansuo Zheng, Hao Zheng, Yan Zhou, and Pei Pei. "Seismic behavior of confined masonry walls subjected to freeze-thaw cycles." Construction and Building Materials 186 (October 2018): 131–44. http://dx.doi.org/10.1016/j.conbuildmat.2018.07.104.

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Apak, S. N., and H. T. Moors. "A SEQUENCE STRATIGRAPHIC DEPOSITIONAL MODEL OF NEOPROTEROZOIC STRATA, YOWALGA AREA, OFFICER BASIN,WESTERN AUSTRALIA." APPEA Journal 40, no. 1 (2000): 15. http://dx.doi.org/10.1071/aj99001.

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Additional data and further studies have now improved geological, geophysical, and geochemical understanding of the Neoproterozoic strata of the Officer Basin. New sequence stratigraphic analysis of continuously cored drillholes (particularly Empress–1/1A), extended throughout the area with wireline log and seismic correlations, provide enhanced recognition of depositional fades and thus basin architecture. Four major flooding events and fifteen sedimentary successions, interpreted as parasequence sets by regional correlation, are recognised across the Yowalga area. These parasequence sets are

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Geary, Andrew. "Seismic Soundoff: Breaking down the life cycle of a well." Leading Edge 41, no. 4 (2022): 284. http://dx.doi.org/10.1190/tle41040284.1.

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In this episode, Sue Carr and Patrick Meroney discuss the importance of a shared definition of a well, the most important well component for geophysicists, the five life cycles of a well, and why well logs are key to successful drilling. Hear the full episode at https://seg.org/podcast/post/13689 .

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Hyodo, Mamoru, and Takane Hori. "Modeling of Nankai earthquake cycles: Influence of 3D geometry of the Philippine Sea plate on seismic cycles." JAMSTEC Report of Research and Development 11 (2011): 1–15. http://dx.doi.org/10.5918/jamstecr.11.1.

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