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Journal articles on the topic 'Strike slip fault zone'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Johnson, Jeffrey A. "Off-fault Deformation Associated with Strike-slip Faults." Environmental and Engineering Geoscience 24, no. 4 (2018): 375–84. http://dx.doi.org/10.2113/eeg-2030.

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Abstract Habitable buildings can be protected from surface fault rupture by establishing structure “setback zones” similar in purpose to legally mandated zones in California and Utah. But post-earthquake surveys of offset and warped linear cultural features, believed to have been straight prior to the event, demonstrate that potentially damaging inelastic strains or off-fault deformation can extend tens of meters beyond the principal slip zone of strike-slip surface fault ruptures. Setback zones designed to also mitigate off-fault deformation are likely to be prohibitively wide, indicating the

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2

Catalán Ormeño, Nicole Stephanie, Klaus Bataille, Andrés Tassara, and Rodolfo Araya. "Depth-dependent geometry of margin-parallel strike-slip faults within oblique subduction zones." Andean Geology 44, no. 1 (2017): 79. http://dx.doi.org/10.5027/andgeov44n1-a05.

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Based on the principle that faults develop where shear stress is maximum, we determine the depth-dependent geometry of margin-parallel strike-slip faults within oblique subduction zones. Using an elastic half-space model for the south Chile subduction zone, we show that the geometry of a margin-parallel strike-slip fault as the Liquiñe-Ofqui Fault Zone (LOFZ), is vertical near the free surface and curved downwards, until reaching the subducting slab. This geometry is compatible with the observations of reflectors on seismic data obtained from wide angle refraction studies in southern Chile. GP

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3

ALEKSANDROWSKI, P., R. KRYZA, S. MAZUR, and J. ŻABA. "Kinematic data on major Variscan strike-slip faults and shear zones in the Polish Sudetes, northeast Bohemian Massif." Geological Magazine 134, no. 5 (1997): 727–39. http://dx.doi.org/10.1017/s0016756897007590.

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The still highly disputable terrane boundaries in the Sudetic segment of the Variscan belt mostly seem to follow major strike-slip faults and shear zones. Their kinematics, expected to place important constraints on the regional structural models, is discussed in some detail. The most conspicuous is the WNW–ESE Intra-Sudetic Fault Zone, separating several different structural units of the West Sudetes. It showed ductile dextral activity and, probably, displacement magnitude of the order of tens to hundreds kilometres, during late Devonian(?) to early Carboniferous times. In the late Carbonifer

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4

Reid, L. F., P. S. Simony, and G. M. Ross. "Dextral strike-slip faulting in the Cariboo Mountains, British Columbia: a natural example of wrench tectonics in relation to Cordilleran tectonics." Canadian Journal of Earth Sciences 39, no. 6 (2002): 953–70. http://dx.doi.org/10.1139/e02-017.

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The Cariboo Mountains, British Columbia, contain an intracontinental dextral strike-slip fault system that crosscuts the regional fold structures. This fault system accounts for a minimum of 120 km and a maximum of 200 km of dextral strike-slip displacement. This probably accommodates some of the motion associated with the southern termination of the Northern Rocky Mountain Trench Fault and is part of a step-over zone between the Northern Rocky Mountain Trench Fault and the Fraser River Straight Creek fault systems. The Isaac Lake Synclinorium is a kilometre-scale Jurassic fold structure tha

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5

Konon, Andrzej, Szymon Ostrowski, Barbara Rybak-Ostrowska, et al. "Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?" Acta Geologica Polonica 66, no. 3 (2016): 435–55. http://dx.doi.org/10.1515/agp-2016-0019.

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Abstract A newly recognized Mnin restraining stepover is identified in the Permo-Mesozoic cover of the western part of the Late Palaeozoic Holy Cross Mountains Fold Belt (Poland), within a fault pattern consisting of dextral strike-slip faults. The formation of a large contractional structure at the Late Cretaceous – Cenozoic transition displays the significant role of strike-slip faulting along the western border of the Teisseyre-Tornquist Zone, in the foreland of the Polish part of the Carpathian Orogen. Theoretical relationships between the maximum fault offsets/ mean step length, as well a

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6

Huang, Lei, Chi-yang Liu, Jun-feng Zhao, and Dong-dong Zhang. "Synrift basin inversion: Significant role of synchronous strike-slip motion in a rift basin." GSA Bulletin 132, no. 11-12 (2020): 2572–86. http://dx.doi.org/10.1130/b35435.1.

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Abstract In rift basins with superposed strike-slip deformation, the structural style of wrench elements and the roles they play in synrift architecture and evolution are important, poorly understood issues for basin analysis and hydrocarbon exploration. The NE-SW–striking Tan-Lu fault zone, located in eastern China, runs through the Liaodong Bay subbasin within the Cenozoic Bohai Bay Basin and experienced dextral strike-slip motion during the later synrift stage of the basin (ca. 40 Ma to 23 Ma). Investigations of the Liaodong Bay subbasin indicate that rift-fault reactivation and wrench-faul

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7

Kearse, Jesse, Yoshihiro Kaneko, Tim Little, and Russ Van Dissen. "Curved slickenlines preserve direction of rupture propagation." Geology 47, no. 9 (2019): 838–42. http://dx.doi.org/10.1130/g46563.1.

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Abstract Slip-parallel grooves (striations) on fault surfaces are considered a robust indicator of fault slip direction, yet their potential for recording aspects of earthquake rupture dynamics has received little attention. During the 2016 Kaikōura earthquake (South Island, New Zealand), >10 m of dextral strike-slip on the steeply dipping Kekerengu fault exhumed >200 m2 of fresh fault exposure (free faces) where it crossed bedrock canyons. Inscribed upon these surfaces, we observed individual striae up to 6 m long, all of which had formed during the earthquake. These were typically curv

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8

Little, T. A., P. Morris, M. P. Hill, et al. "Coseismic deformation of the ground during large-slip strike-slip ruptures: Finite evolution of “mole tracks”." Geosphere 17, no. 4 (2021): 1170–92. http://dx.doi.org/10.1130/ges02336.1.

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Abstract To evaluate ground deformation resulting from large (~10 m) coseismic strike-slip displacements, we focus on deformation of the Kekerengu fault during the November 2016 Mw 7.8 Kaikōura earthquake in New Zealand. Combining post-earthquake field observations with analysis of high-resolution aerial photography and topographic models, we describe the structural geology and geomorphology of the rupture zone. During the earthquake, fissured pressure bulges (“mole tracks”) initiated at stepovers between synthetic Riedel (R) faults. As slip accumulated, near-surface “rafts” of cohesive clay-r

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McMechan, M. E. "Walker Creek fault zone, central Rocky Mountains, British Columbia-southern continuation of the Northern Rocky Mountain Trench fault zone." Canadian Journal of Earth Sciences 37, no. 9 (2000): 1259–73. http://dx.doi.org/10.1139/e00-038.

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Walker Creek fault zone (WCFZ), well exposed in the western Rocky Mountains of central British Columbia near 54°, comprises a 2 km wide zone of variably deformed Neoproterozoic and Cambrian strata in fault-bounded slivers and lozenges. Extensional shear bands, subhorizontal extension lineations, slickensides, mesoscopic shear bands, and other minor structures developed within and immediately adjacent to the fault zone consistently indicate right-lateral displacement. Offset stratigraphic changes in correlative Neoproterozoic strata indicate at least 60 km of right-lateral displacement across t

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Snyder, David B., Brian J. Roberts, and Steven P. Gordey. "Contrasting seismic characteristics of three major faults in northwestern Canada." Canadian Journal of Earth Sciences 42, no. 6 (2005): 1223–37. http://dx.doi.org/10.1139/e05-027.

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The Lithoprobe Slave Northern Cordillera Lithospheric Evolution (SNORCLE) profiles crossed three major tectonic zones of the northwestern Canadian Shield and northern Canadian Cordillera that are diverse in age and in depth of penetration. The oldest (26302590 Ma), the Yellowknife River fault zone, formed as a strike-slip fault in a tensional strain regime. Reflector attenuation or truncations align vertically beneath the fault trace through much of the crust, implying a near-vertical fault plane. The youngest (6010 Ma), the Tintina fault zone, produced cumulative dextral strike-slip displ

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Bellot, Jean-Philippe, Jean-Yves Roig, and Antonin Genna. "The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension." Bulletin de la Société Géologique de France 176, no. 2 (2005): 151–59. http://dx.doi.org/10.2113/176.2.151.

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Abstract Structural and microstructural analyses of the Argentat fault, combined with sedimentological and structural analyses of the associated Hospital basin allow us to discuss the tectonic control of coal basins by crustal-scale faults during the late Palaeozoic evolution of the Variscan lithosphere in the French Massif Central. The brittle Argentat fault zone consists of first- and second-order strike-slip faults, with dominant NNW-sinistral faults, NNE-dextral or sinistral faults and secondary ENE-dextral faults. Several experimental and theoretical models explain the observed fault patt

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Marinin, A. V., and T. Yu Tveritinova. "Paleostress reconstructions and structure of the Tuapse strike-slip fault." Moscow University Bulletin. Series 4. Geology, no. 1 (February 28, 2016): 41–55. http://dx.doi.org/10.33623/0579-9406-2016-1-41-55.

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The results of the field structural studies of Northwest Caucasus Tuapse Shear Zone are presented. There are strike-slip displacements of different scale and the domination of horizontal shear conditions (type of geodynamic stress state that cause the formation of faults with mainly lateral movement of the wings along strike fault surface) within this zone. Using the method of cataclastic analysis of the collected geological paleostresses indicators the quantitative characteristics of the local stress states within the shear zone - position of the principal stresses axes and the Lode-Nadai coe

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Zhang, Yu Hang, Xing Yan Li, and Zhi Feng Yan. "Transfer Zone Characteristics in No. II Fault Zone and its Control on Petroleum, TaZhong Area." Advanced Materials Research 356-360 (October 2011): 3009–15. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.3009.

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According to interpreted cautiously with 2D and 3D seismic profiles, the typical transfer zone was identified in No.Ⅱ fault zone of TaZhong area, near the TaZhong 46 well of central uplift belt in Tarim basin. Discussed the transfer zone characteristic on the basis of seismic interpretation, it’s clearly triangle transfer zone and caused by strike-slip affection. Using structural analysis method, it is indicated that the transfer zone composed by thrusting-detachment faults. According to structural evolution analysis, the transfer zone had been affecting constantly by transpression during the

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Ma, Bingshan, Jiafu Qi, and Jiawang Ge. "Development of two-phase transfer zones during multiphase rifting and their influence on sedimentation in the Baxian Sag, Bohai Bay Basin, northern China." Geological Magazine 156, no. 11 (2019): 1821–38. http://dx.doi.org/10.1017/s0016756819000190.

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AbstractWe investigate the formation and deformation of transfer zones and their impact on sedimentation during multiphase rifting using a three-dimensional seismic dataset in the Baxian Sag, the onshore part of the Bohai Bay Basin, northern China. The fault system in the study area is dominated by two arcuate, opposing boundary faults, that is, the Niudong and Maxi faults, which form an S-type fault system which does not link together. The fault system and structural-stratigraphic features between the Eocene and Oligocene syn-rift sequences were distinctly different during the Palaeogene rift

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Brune, James N., and Abdolrasool Anooshehpoor. "A physical model of the effect of a shallow weak layer on strong ground motion for strike-slip ruptures." Bulletin of the Seismological Society of America 88, no. 4 (1998): 1070–78. http://dx.doi.org/10.1785/bssa0880041070.

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Abstract We report results of foam rubber modeling of the effect of a shallow weak layer on ground motion from strike-slip ruptures. Computer modeling of strong ground motion from strike-slip earthquakes has in some cases involved somewhat arbitrary assumptions about the nature of slip along the shallow part of the fault (e.g., fixing the slip to be zero along the upper 2 km of the fault plane). Fault-slip inversion studies indicate that the high-frequency radiation from the shallow part of strike-slip faults is typically less than that for the deeper parts of the fault. In many cases, faults

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16

Utkin, V. P., A. N. Mitrokhin, P. L. Nevolin, and Y. P. Yushmanov. "Strike-slip fault tectogenesis in formation of the East Sikhote-Alin volcano-plutonic belt: Structural and dynamic analysis." LITHOSPHERE (Russia) 20, no. 4 (2020): 528–41. http://dx.doi.org/10.24930/1681-9004-2020-20-4-528-541.

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Study object. The role of strike-slip fault tectogenesis in magmatism of the large (North Eastern Primorye) fragment of the Eastern Sikhote-Alin volcano-plutonic belt (ESAVPB) is studied. Materials and methods. The materials of geological mapping and field geostructural thematic-line research are used. Study methods are based on the concept of the geostructural patterns being formed by lateral, namely, strike-slip movements of crustal blocks. Results. There is recognized the system of the NE-trending sinistral faults, whose activation taken place during two stages. The pre-Late-Cretaceous fold

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Sakellariou, D., H. Sigurdsson, M. Alexandri, et al. "ACTIVE TECTONICS IN THE HELLENIC VOLCANIC ARC: THE KOLUMBO SUBMARINE VOLCANIC ZONE." Bulletin of the Geological Society of Greece 43, no. 2 (2017): 1056. http://dx.doi.org/10.12681/bgsg.11270.

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This paper studies the rupture system of the Anydhros Basin, northeast of Thera island, and its relationship to the submarine volcanic activity along the Kolumbo line. Anydhros Basin is a N45o E trending elongate basin bounded by the Ios-Fault-Zone (IFZ) towards NW and by the AnydhrosFault-Zone (AFZ) towards SE. The AFZ continues southwestwards, crosscutting Thera Island. Swath bathymetry and seismic profiling data indicate that the Anydhros basin sedimentary infill is fractured by vertical, predominantly strike-slip faults, parallel to which the volcanic cones are aligned. We propose that the

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Nkodia, H. M. D.-V., T. Miyouna, D. Delvaux, and F. Boudzoumou. "Flower structures in sandstones of the Paleozoic Inkisi Group (Brazzaville, Republic of Congo): evidence for two major strike-slip fault systems and geodynamic implications." South African Journal of Geology 123, no. 4 (2020): 531–50. http://dx.doi.org/10.25131/sajg.123.0038.

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Abstract Few studies have reported field descriptions of flower structures associated with strike-slip faults. This study describes and illustrates flower structures near Brazzaville (Republic of Congo) and explains their implication for the tectonic history of the Paleozoic Inkisi Group. Field observations show that the Inkisi Group is affected by two major strike-slip fault systems. The oldest system is dominated by north-northwest–south-southeast striking sinistral strike-slip faults and minor east–west striking dextral strike-slip faults. The youngest system consists of dominant northeast–

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Wang, Ziyi, Zhiqian Gao, Tailiang Fan, Hehang Zhang, Lixin Qi, and Lu Yun. "Hydrocarbon-bearing characteristics of the SB1 strike-slip fault zone in the north of the Shuntuo Low Uplift, Tarim Basin." Petroleum Geoscience 27, no. 1 (2020): petgeo2019–144. http://dx.doi.org/10.1144/petgeo2019-144.

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The SB1 strike-slip fault zone, which developed in the north of the Shuntuo Low Uplift of the Tarim Basin, plays an essential role in reservoir formation and hydrocarbon accumulation in deep Ordovician carbonate rocks. In this research, through the analysis of high-quality 3D seismic volumes, outcrop, drilling and production data, the hydrocarbon-bearing characteristics of the SB1 fault are systematically studied. The SB1 fault developed sequentially in the Paleozoic and formed as a result of a three-fold evolution: Middle Caledonian (phase III), Late Caledonian–Early Hercynian and Middle–Late

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Wu, Jingfeng, Qi'an Meng, Xiaofei Fu, et al. "Study on the relationship between multi-stage strike-slip mechanism and basin evolution in Fangzheng fault depression." Earth Sciences Research Journal 22, no. 4 (2018): 335–39. http://dx.doi.org/10.15446/esrj.v22n4.77380.

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Fangzheng fault depression is controlled by the northern of the Tan-Lu fault zone. It undergoes multi-stage strike-slip, extrusion modification, and erosion of the thermal uplift, forming a tectonic pattern of uplifts connected with sags. Through the regional dynamic analysis, the study of the activity law of the western Pacific plate has clarified the formation and transformation of the regional tectonic stress field. Under the background of the multi-stage of the strike-slip mechanism in the northern part of the Tan-lu fault, the Fangzheng fault depression has a characteristic of the “left-l

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KOTHYARI, G. C., R. K. DUMKA, A. P. SINGH, G. CHAUHAN, M. G. THAKKAR, and S. K. BISWAS. "Tectonic evolution and stress pattern of South Wagad Fault at the Kachchh Rift Basin in western India." Geological Magazine 154, no. 4 (2016): 875–87. http://dx.doi.org/10.1017/s0016756816000509.

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AbstractWe describe a study of the E–W-trending South Wagad Fault (SWF) complex at the eastern part of the Kachchh Rift Basin (KRB) in Western India. This basin was filled during Late Cretaceous time, and is presently undergoing tectonic inversion. During the late stage of the inversion cycle, all the principal rift faults were reactivated as transpressional strike-slip faults. The SWF complex shows wrench geometry of an anastomosing en échelon fault, where contractional and extensional segments and offsets alternate along the Principal Deformation Zone (PDZ). Geometric analysis of different s

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Sadeghi, Shahriar, and Ali Yassaghi. "Spatial evolution of Zagros collision zone in Kurdistan, NW Iran: constraints on Arabia–Eurasia oblique convergence." Solid Earth 7, no. 2 (2016): 659–72. http://dx.doi.org/10.5194/se-7-659-2016.

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Abstract. Stratigraphy, detailed structural mapping and a crustal-scale cross section across the NW Zagros collision zone provide constraints on the spatial evolution of oblique convergence of the Arabian and Eurasian plates since the Late Cretaceous. The Zagros collision zone in NW Iran consists of the internal Sanandaj–Sirjan, Gaveh Rud and Ophiolite zones and the external Bisotoun, Radiolarite and High Zagros zones. The Main Zagros Thrust is the major structure of the Zagros suture zone. Two stages of oblique deformation are recognized in the external part of the NW Zagros in Iran. In the e

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Pratt, Thomas L., James F. Dolan, Jackson K. Odum, William J. Stephenson, Robert A. Williams, and Mary E. Templeton. "Multiscale seismic imaging of active fault zones for hazard assessment: A case study of the Santa Monica fault zone, Los Angeles, California." GEOPHYSICS 63, no. 2 (1998): 479–89. http://dx.doi.org/10.1190/1.1444349.

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High‐resolution seismic reflection profiles at two different scales were acquired across the transpressional Santa Monica Fault of north Los Angeles as part of an integrated hazard assessment of the fault. The seismic data confirm the location of the fault and related shallow faulting seen in a trench to deeper structures known from regional studies. The trench shows a series of near‐vertical strike‐slip faults beneath a topographic scarp inferred to be caused by thrusting on the Santa Monica fault. Analysis of the disruption of soil horizons in the trench indicates multiple earthquakes have o

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Qu, Shao Dong, Chi Yang Liu, Li Jun Song, Hui Deng, Long Zhang, and Guang Zhou Mao. "Structure Evolution of Qinjiatun-Qindong Fault System in Lishu Subbasin." Advanced Materials Research 734-737 (August 2013): 170–77. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.170.

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Three-dimensional(3-D) seismic data and structure analysis of the Lishu subasin in Songliao basin indicates that Qinjiatun fault zone is composed of two faults: East-Qin and West-Qin fault. This fault system initially formed at Huoshiling stage, peaked at Shahezi stage and faded dramatically from Yingcheng stage. The Qinjiatun fault was important in controlling strata thickness and distribution of the Huoshiling formation. Qindong fault, a typical strike-slip fault, developed relatively later, cutting the Qinjiatun fault, The major active stage was in Denglouku-Quantou stage, and weakened in t

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Egebjerg Mogensen, Tommy, and John A. Korstgård. "Triassic and Jurassic transtension along part of the Sorgenfrei–Tornquist Zone in the Danish Kattegat." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 437–58. http://dx.doi.org/10.34194/geusb.v1.4680.

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In the Kattegat area, Denmark, the Sorgenfrei–Tornquist Zone, an old crustal weakness zone, was repeatedly reactivated during Triassic, Jurassic and Early Cretaceous times with dextral transtensional movements along the major boundary faults. These tectonic events were minor compared to the tectonic events of the Late Carboniferous – Early Permian and the Late Cretaceous – Early Tertiary, although a dynamic structural and stratigraphic analysis indicates that the Sorgenfrei–Tornquist Zone was active compared to the surrounding areas. At the end of the Palaeozoic, the area was a peneplain. Regi

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Andreani, Louis, Claude Rangin, Juventino Martínez-Reyes, et al. "The Neogene Veracruz fault: evidences for left-lateral slip along the southern Mexico block." Bulletin de la Société Géologique de France 179, no. 2 (2008): 195–208. http://dx.doi.org/10.2113/gssgfbull.179.2.195.

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Abstract Structural data combined with analysis of satellite images and seismic profiles show that a major left-lateral strike-slip fault affects the Veracruz basin and post-5 Ma volcanic rocks of the Los Tuxtlas volcanic field (LTVF). The main volcanic alignment of the LTVF is located along this fault. Additional structural data collected in the Trans-Mexican volcanic belt (areas of Xalapa, Teziutlán and Huauchinango) show that the shear zone affects Pliocene Trans-Mexican volcanic rocks. Low seismicity associated to faulted Quaternary markers such as alluvial fans, alluvial terraces and vol

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Kovac, Peter, Luke Titus, Carlos Cevallos, and Josh Bluett. "Exploring for unconventional hydrocarbon plays in the Glyde Basin, Northern Territory, using FALCON® airborne gravity gradiometry (AGG) data." APPEA Journal 54, no. 2 (2014): 519. http://dx.doi.org/10.1071/aj13092.

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A FALCON® AGG and magnetic survey in the Glyde Sub-basin aims to define the structural pattern to identify unconventional hydrocarbon plays. The survey area consists of variable thick fluvial and lacustrine to shallow marginal marine carbonate-siliciclastic sequences and lesser volcanic rocks. The dominant tectonic feature identified on the AGG data is the Emu Fault Zone: a major structure of the central-southern part of the McArthur Basin. Seismic and surface geology suggest its overall sub-vertical strike-slip nature with positive flower structure geometry. In the north, a regional size pop-

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Angster, Stephen J., Steven G. Wesnousky, Paula M. Figueiredo, Lewis A. Owen, and Sarah J. Hammer. "Late Quaternary slip rates for faults of the central Walker Lane (Nevada, USA): Spatiotemporal strain release in a strike-slip fault system." Geosphere 15, no. 5 (2019): 1460–78. http://dx.doi.org/10.1130/ges02088.1.

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Abstract The Walker Lane is a broad shear zone that accommodates a significant portion of North American–Pacific plate relative transform motion through a complex of fault systems and block rotations. Analysis of digital elevation models, constructed from both lidar data and structure-from-motion modeling of unmanned aerial vehicle photography, in conjunction with 10Be and 36Cl cosmogenic and optically stimulated luminescence dating define new Late Pleistocene to Holocene minimum strike-slip rates for the Benton Springs (1.5 ± 0.2 mm/yr), Petrified Springs (0.7 ± 0.1 mm/yr), Gumdrop Hills (0.9

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Aiken, Chastity, Richard Wessels, Marie-Hélène Cormier, et al. "Haiti-Drill: an amphibious drilling project workshop." Scientific Drilling 28 (December 1, 2020): 49–62. http://dx.doi.org/10.5194/sd-28-49-2020.

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Abstract. The Haiti region – bounded by two strike-slip faults expressed both onshore and offshore – offers a unique opportunity for an amphibious drilling project. The east–west (EW)-striking, left lateral strike-slip Oriente–Septentrional fault zone and Enriquillo–Plantain Garden fault zone bounding Haiti have similar slip rates and also define the northern and southern boundaries of the Gonâve Microplate. However, it remains unclear how these fault systems terminate at the eastern boundary of that microplate. From a plate tectonic perspective, the Enriquillo–Plantain Garden fault zone can b

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Yelin, Thomas S., and Howard J. Patton. "Seismotectonics of the Portland, Oregon, region." Bulletin of the Seismological Society of America 81, no. 1 (1991): 109–30. http://dx.doi.org/10.1785/bssa0810010109.

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Abstract Portland, Oregon, lies in the southern half of an approximately rectangular basin measuring 30 by 50 km. Since 1969, there have been no earthquakes with M ≥ 4.0 in or on the margins of the Portland basin, but this level of seismicity may not be characteristic of the region. Using microseismicity data collected by the University of Washington regional short-period seismograph network for the period mid-1982 through 1989, we have determined P-wave focal mechanisms for four individual earthquakes and three groups of earthquakes. We have also relocated the 6 November 1962, MW = 5.2 Portla

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Schuck, Bernhard, Anja M. Schleicher, Christoph Janssen, Virginia G. Toy, and Georg Dresen. "Fault zone architecture of a large plate-bounding strike-slip fault: a case study from the Alpine Fault, New Zealand." Solid Earth 11, no. 1 (2020): 95–124. http://dx.doi.org/10.5194/se-11-95-2020.

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Abstract. New Zealand's Alpine Fault is a large, plate-bounding strike-slip fault, which ruptures in large (Mw>8) earthquakes. We conducted field and laboratory analyses of fault rocks to assess its fault zone architecture. Results reveal that the Alpine Fault Zone has a complex geometry, comprising an anastomosing network of multiple slip planes that have accommodated different amounts of displacement. This contrasts with the previous perception of the Alpine Fault Zone, which assumes a single principal slip zone accommodated all displacement. This interpretation is supported by results of

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Kirkwood, Donna, and Michel Malo. "Across-strike geometry of the Grand Pabos fault zone: evidence for Devonian dextral transpression in the Quebec Appalachians." Canadian Journal of Earth Sciences 30, no. 7 (1993): 1363–73. http://dx.doi.org/10.1139/e93-117.

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The principal faults of southeastern Gaspé Peninsula in Quebec consist of a central high-strain zone that is characterized by mainly ductile deformation structures and bordered by low-strain zones each dominated by brittle deformation structures. The overall geometry of shear fractures within the low-strain zones is quite similar to the expected geometry of Riedel shear fractures. The brittle structures overprint the dominant C–S-type fabric of the high-strain zone, which implies that brittle deformation outlasted ductile deformation. The asymmetry of local micro- to meso-scale deformation fea

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Li, Yuexin, Roland Bürgmann, and Bin Zhao. "Evidence of Fault Immaturity from Shallow Slip Deficit and Lack of Postseismic Deformation of the 2017 Mw 6.5 Jiuzhaigou Earthquake." Bulletin of the Seismological Society of America 110, no. 1 (2020): 154–65. http://dx.doi.org/10.1785/0120190162.

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ABSTRACT The Mw 6.5 Jiuzhaigou earthquake occurred on 8 August 2017 36 km west-southwest of Yongle, Sichuan, China. We use both ascending and descending Interferometric Synthetic Aperture Radar (InSAR) data from Sentinel-1 and coseismic offsets of four Global Positioning System sites to obtain the coseismic surface deformation field and invert for the fault geometry and slip distribution. Most slip of the left-lateral strike-slip earthquake occurred in the 3–10 km depth interval with a maximum slip of about 1 m and a large shallow slip deficit (SSD). An eight-month InSAR time-series analysis d

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Srivastava, Deepak C., Ajanta Goswami, and Amit Sahay. "Strain-partitioned dextral transpression in the Great Boundary Fault Zone around Chittaurgarh, NW Indian Shield." Geological Magazine 158, no. 9 (2021): 1585–99. http://dx.doi.org/10.1017/s0016756821000157.

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AbstractDelimiting the Aravalli mountain range in the east, the Great Boundary Fault (GBF) occurs as a crustal-scale tectonic lineament in the NW Indian Shield. The structural and tectonic characteristics of the GBF are, as yet, not well-understood. We attempt to fill this gap by using a combination of satellite image processing, high-resolution outcrop mapping and structural analysis around Chittaurgarh. The study area exposes the core and damage zone of the GBF. Three successive phases of folding, F1, F2 and F3, are associated with deformation in the GBF. The large-scale structural character

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Azmi, Azrin, Norasiah Sulaiman, Muhammad Ashahadi Dzulkafli, and Zaiton Harun. "Transpressional Deformation Of Bukit C, Guar Sanai: Lithostratigraphic Implication." Bulletin Of The Geological Society Of Malaysia 70, no. 1 (2020): 77–86. http://dx.doi.org/10.7186/bgsm70202006.

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The upper part of the Setul Formation and the lower part of the Kubang Pasu Formation are well exposed in Guar Sanai, Perlis due to the earth quarry activities. However, compared to the Hill A and Hill B, the outcrops in Hill C clearly illustrates the influence of structure on the lithostratigraphy of the area. The boundary between the Setul Formation and the Kubang Pasu Formation is marked by the thrust fault generally trending north-south to northeast-southwest and mylonite. The thrust belt associated with folding and uplift clearly developed in the zone between parallel lateral faults (tren

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Ji, Jie, Kongyou Wu, Yangwen Pei, Wenjian Guo, Yin Liu, and Tianran Li. "Fault Sealing Evaluation of a Strike-Slip Fault Based on Normal Stress: A Case Study from Eastern Junggar Basin, NW China." Energies 14, no. 5 (2021): 1468. http://dx.doi.org/10.3390/en14051468.

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The sealing of a fault zone has been a focus for geological studies in the past decades. The majority of previous studies have focused on the extensional regimes, where the displacement pressure difference between fault rock and reservoir was used to evaluate the fault-sealing property from the basic principle of fault sealing. When considering the displacement pressure difference, the impact of gravity on the fault rock was considered, whereas the impact of horizontal stress was ignored. In this study, we utilize the displacement pressure difference as an index to evaluate the sealing capacit

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Trudel, Claude, and Michel Malo. "Analyses des contraintes par méthodes graphiques dans une zone de coulissage : exemple de la région de Matapédia, Gaspésie, Appalaches du Québec." Canadian Journal of Earth Sciences 30, no. 3 (1993): 591–602. http://dx.doi.org/10.1139/e93-045.

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The north-northeast trending Sellarsville and Rafting Ground faults are southeasterly directed Acadian (Devonian) thrusts in the Québec Appalachians. They are located at the western end of the Grand Pabos fault system, a dextral strike-slip fault system that transects Upper Ordovician to Lower Devonian sedimentary rocks in the southern Gaspé Peninsula. The structural analysis of mesoscopic brittle and brittle–ductile shear zones by graphical methods was used to determine the stress field related to these two faults. The attitude of slip lines was calculated when the slickenside striations were

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Allanic, Cécile, and Charles Gumiaux. "Are there any active faults within the Lepontine dome (central Alps)?" Bulletin de la Société Géologique de France 184, no. 4-5 (2013): 427–40. http://dx.doi.org/10.2113/gssgfbull.184.4-5.427.

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Abstract In metamorphic chain areas characterized by low seismicity, the evidence of neotectonic activity is generally very poor. However, direct evidences of seismogenic faults are reported hereafter in the Lepontine dome (Central Alps) considered in the literature as tectonically quiescent. Identification of aligned cluster of microseismic events guided morphotectonic researches. The latter revealed clear clues of recent faulting, i.e. marked scarps, perturbation of the drainage system or shift of terminal moraines. Thus, thanks to combination of seismological, geological and morphological d

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Scharf, Andreas, Frank Mattern, and Sawsan S. Al-Sadi. "Kinematics of Post-obduction Deformation of the Tertiary Ridge at Al-Khod Village (Muscat, Oman)." Sultan Qaboos University Journal for Science [SQUJS] 21, no. 1 (2016): 26. http://dx.doi.org/10.24200/squjs.vol21iss1pp26-40.

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Structural investigations in post-obductional Paleocene to Eocene limestones of the Tertiary Ridge reveal a ~1 km long WNW-ESE striking strike-slip fault system within the ridge, consisting of two main sub-parallel, strike-slip faults. Considering the geometry of the Harding Strain Ellipse, the orientation of structures between the two strike-slip faults (e.g., Riedel shears, folds, reverse faults) point to left-lateral motion. The abundance of large-scale folds (up to 100 m in wave length and amplitude) between the two strike-slip faults led us to the interpretation of transpressive condition

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Wu, Chenglong, Xiaobo Tian, Tao Xu, et al. "Upper‐Crustal Anisotropy of the Conjugate Strike‐Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear‐Wave Splitting." Bulletin of the Seismological Society of America 109, no. 5 (2019): 1968–84. http://dx.doi.org/10.1785/0120180333.

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Abstract Remarkable V‐shaped conjugate strike‐slip faults extend along the Bangong–Nujiang suture in central Tibet. Motions of these faults are considered to accommodate ongoing east–west extension and north–south contraction. Fabrics within the fault zone that are anisotropic to seismic waves can provide clues as to the unusual scale and style of lithospheric deformation. With the goal of determining the upper‐crustal anisotropy pattern in central Tibet, we measured shear‐wave splitting parameters (fast wave polarization direction and delay time) using waveforms generated by 194 local earthqu

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GÜRER, ÖMER FEYZI, ERCAN SANGU, and MUZAFFER ÖZBURAN. "Neotectonics of the SW Marmara region, NW Anatolia, Turkey." Geological Magazine 143, no. 2 (2006): 229–41. http://dx.doi.org/10.1017/s0016756805001469.

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This study reports on the geometric and structural characteristics of the North Anatolian Fault Zone in the southwest Marmara region. The geometric and kinematic features of the faults in the region are described, based on field observations. In addition, the Neogene and Quaternary basin fill which occupies large areas in the region has been determined, and the tectonic regimes controlling these basins are explained. The neotectonic regime is also explained considering different deformation phases affecting the region. The N–S extension and E–W strike-slip have affected the region possibly sin

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Weidman, Luke, Jillian M. Maloney, and Thomas K. Rockwell. "Geotechnical data synthesis for GIS-based analysis of fault zone geometry and hazard in an urban environment." Geosphere 15, no. 6 (2019): 1999–2017. http://dx.doi.org/10.1130/ges02098.1.

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Abstract Many fault zones trend through developed urban areas where their geomorphic expression is unclear, making it difficult to study fault zone details and assess seismic hazard. One example is the Holocene-active Rose Canyon fault zone, a strike-slip fault with potential to produce a M6.9 earthquake, which traverses the city of San Diego, California (USA). Several strands trend through densely populated areas, including downtown. Much of the developed environment in San Diego predates aerial imagery, making assessment of the natural landscape difficult. To comply with regulations on devel

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Zhang, Yong, Chuanjin Liu, Wenting Zhang, and Fengyun Jiang. "Present-Day Deformation of the Gyaring Co Fault Zone, Central Qinghai–Tibet Plateau, Determined Using Synthetic Aperture Radar Interferometry." Remote Sensing 11, no. 9 (2019): 1118. http://dx.doi.org/10.3390/rs11091118.

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Because of the constant northward movement of the Indian plate and blockage of the Eurasian continent, the Qinghai–Tibet Plateau has been extruded by north–south compressive stresses since its formation. This has caused the plateau to escape eastward to form a large-scale east–west strike-slip fault and a north–south extensional tectonic system. The Karakorum–Jiali fault, a boundary fault between the Qiangtang and Lhasa terranes, plays an important role in the regional tectonic evolution of the Qinghai–Tibet Plateau. The Gyaring Co fault, in the middle of the Karakoram–Jiali fault zone, is a p

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KOKKALAS, S., and A. AYDIN. "Is there a link between faulting and magmatism in the south-central Aegean Sea?" Geological Magazine 150, no. 2 (2012): 193–224. http://dx.doi.org/10.1017/s0016756812000453.

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AbstractA distinct spatial relationship between surface faulting, magmatic intrusions and volcanic activity exists in the Aegean continental crust. In this paper, we provide detailed structural observations from key onshore areas, as well as compilations of lineament maps and earthquake locations with focal plane solutions from offshore areas to support such a relationship. Although pluton emplacement was associated with low-angle extensional detachments, the NNE- to NE-trending strike-slip faults also played an important role in localizing the Middle Miocene plutonism, providing ready pathway

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Koukouvelas, I., G. Pe-Piper, and D. J. W. Piper. "Pluton emplacement by wall-rock thrusting, hanging-wall translation and extensional collapse: latest Devonian plutons of the Cobequid fault zone, Nova Scotia, Canada." Geological Magazine 133, no. 3 (1996): 285–98. http://dx.doi.org/10.1017/s001675680000902x.

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AbstractLatest Devonian A-type granite-gabbro plutons, in part ductilely deformed, are spatially associated with the strike-slip Cobequid fault zone. The youngest intrusions are close to the Cobequid fault zone, which was the main conduit for magma. Two phases of deformation accompanying magma emplacement are recognized. Early magmas intruded ductile rocks during left-lateral oblique thrust movements. A second stage of right-lateral oblique slip normal faulting accommodated uplift of the plutons when coarse granite was emplaced in the crestal regions. Cross-cutting late stage porphyries, grani

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Durling, P., K. Howells, and P. Harvey. "The near-surface geology of St. Georges Bay, Nova Scotia: implications for the Hollow Fault." Canadian Journal of Earth Sciences 32, no. 5 (1995): 603–13. http://dx.doi.org/10.1139/e95-051.

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A formline contour map, which depicts the near-surface, structural configuation of the strata underlying St. Georges Bay, northeastern Nova Scotia, was made from bedding attitude data compiled in the coastal areas; apparent dips measured from single-channel seismic reflection data; and true strikes and dips calculated at survey track intersections. The geology interpreted from the formline map is characterized by northeast-striking faults and fold axes. The folds in the bay comprise broad, open synclines and narrow, tightly folded or faulted anticlines. Gravity and deep seismic reflection data

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Su, Zhe, Xi-Wei Xu, Shan-Shan Liang, and Erchie Wang. "Seismotectonics of the 2017–2018 Songyuan Earthquake Sequence, Northeastern China: Passive Bookshelf Faulting and Block Rotation in the Songliao Basin." Seismological Research Letters 91, no. 3 (2020): 1593–605. http://dx.doi.org/10.1785/0220190251.

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Abstract The high frequency of earthquake clusters generated by pure strike-slip faulting over the past 3 yr (beginning in 2017 in the Songliao basin, northeastern China) has motivated us to consider why lateral strike slip and not extension determines the seismic activity within the Songliao basin. Precise location and characterization of relocated aftershocks, forward modeling of the coseismic displacement field, and Global Positioning System (GPS) monitoring data are combined to detect the possible seismogenic structures of the Songyuan earthquake sequence. The 2017 ML 5.3 aftershock cluste

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Reicherter, K. R., and S. Reiss. "The Carboneras Fault Zone (southeastern Spain) revisited with Ground Penetrating Radar – Quaternary structural styles from high-resolution images." Netherlands Journal of Geosciences 80, no. 3-4 (2001): 129–38. http://dx.doi.org/10.1017/s0016774600023799.

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AbstractThe Carboneras Fault Zone (CFZ) represents an active set of sinistral strike-slip faults in the Betic Cordilleras of southeastern Spain. It constitutes a major segment of the ‘Trans-Alboran shear zone’ during the Cenozoic, striking NE-SW. The CFZ separates the Cabo de Gata Block (Neogene volcanics) against Neogene basinal sediments and the metamorphic basement of the Alpujarride Complex.Three sites along the CFZ were examined with Ground Penetrating Radar techniques. Radar surveying was complemented by structural studies. Shallow-depth high-resolution imaging of Tyrrhenian beach terrac

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Mukti, Maruf M., Ilham Arisbaya, and Haryadi Permana. "Termination of a Trench-Linked Strike-Slip Fault Zone in the Sumatra–Java Forearc Basin and Accretionary Wedge Complex." Jurnal Geologi dan Sumberdaya Mineral 21, no. 4 (2020): 177. http://dx.doi.org/10.33332/jgsm.geologi.v21i4.492.

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This paper presents a review of several published seismic reflection and seismicity data and analyzes of high-resolution bathymetry data to revise the exact location and reveal detail characteristics of a strike-slip fault zone that formed the southernmost segment of the Sumatran Fault (SF). Previous works interpreted this fault segment as a horst structure to the south of a pull-apart basin. We observe a clear linear trace of dissected seafloor parallels to SF in the high-resolution bathymetric map. This structure extends from the south of a pull-apart basin in the northwest to the Sunda accr

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Oglesby, David D. "What Can Surface-Slip Distributions Tell Us about Fault Connectivity at Depth?" Bulletin of the Seismological Society of America 110, no. 3 (2020): 1025–36. http://dx.doi.org/10.1785/0120190245.

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ABSTRACT Fault systems with stepovers and gaps along strike are ubiquitous in nature, and many modern earthquakes (e.g., 1992 Landers, 1999 Hector Mine, 2016 Kaikōura, and 2019 Ridgecrest) have shown that ruptures can readily propagate across some disconnections, while being halted by others. It is quite possible, however, that many faults that appear discontinuous at the surface are in fact connected at depth, facilitating throughgoing rupture, and potentially increasing earthquake size. The present work explores whether the mapped surface slip in an earthquake is indicative of the connectivi

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