Contemporary tectonic stress field in China

Wan, Yizhao

doi:10.1007/s11589-010-0735-5

Cited by 31 publications

(17 citation statements)

References 29 publications

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“…As indicated by the recent study by Qu et al (2014) based on a near 10-year GPS data, the Taiyuan basin is now still extending with an extensional rate of *2.8 mm/yralong the near NW-SE direction. The comparison of the stress field with previous studies, e.g., , (2008) and Wan (2010), shows that it generally agrees to the stress field in a large scale, indicating that in the area around the Taigu fault the local stress field is still mainly controlled by the stress field in a large scale.…”

Section: Discussionsupporting

confidence: 74%

Regional stress field around the Taigu fault zone in Shanxi Province, China

Sørensen

et al. 2015

Earthq Sci

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A comprehensive study on regional stress field around the Taigu fault zone in Shanxi Province, China, was performed in this study. To get a better understanding of the present-day stress status in this area, 31 focal mechanisms of M L C3 earthquakes since 1965 were compiled, and the best stress tensor was then inverted based on the database. Additionally, magnetic fabrics along the Taigu fault zone were investigated to get an indication of the regional stress field in the past. Our results show that the present-day stress field around the Taigu fault zone is characterized by astable NW-SE extension with a strikeslip component, consistent with the geological surveys and recent GPS data. Results from magnetic fabrics indicate that the orientations of principal stress axes from magnetic fabrics of sedimentary rocks in Neogene coincide to the orientations of principal stress axes from focal mechanisms. The south segment of the Taigu fault displays more complicated magnetic fabrics and more activity of moderate earthquakes. It is connected with the Mianshan west fault and intersects with NW-SE striking Fenyang fault and the north fault of the Lingshi uplift at the south edge of Taiyuan basin. This may be the area needing more attention in terms of seismic risk along the Taigu fault.

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Section: Discussionsupporting

confidence: 74%

Regional stress field around the Taigu fault zone in Shanxi Province, China

Sørensen

et al. 2015

Earthq Sci

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“…thrusted northward and the Eurasia and Tibetan Plateau have been disintegrated into fault blocks (Xu and Zhao 2006;Ping 2012). As a result of the southeastward extrusion of the Tibetan Plateau, the tectonic stress field of Guizhou whose direction of principal stress is WNW-ESE direction, has been formed and continued to this day (Xie et al 1999;Wan 2010). Due to the southeastward extrusion of the Tibetan Plateau, the crust of Sancha river catchment has tilted from the northwest to southeast as a concrete manifestation of fault blocks in different amounts of uplifts.…”

Section: Discussionmentioning

confidence: 99%

The development and evolution of landform based on neotectonic movement: The Sancha river catchment in the southwestern China

Lingmin

Yang

et al. 2018

J Earth Syst Sci

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Neotectonics has changed the coupled process of endogenic and exogenic geological dynamics, which mold the modern landform. Geomorphologic analysis is essential for identifying and understanding the tectonic activity and indicates the responsive mechanism of the landform to tectonic activity. At first, this research reconstructed the twisted Shanpen period planation surface, computed the valley floor width-to-height ratio of Sancha river and extracted the cross sections marking the river terraces to analyze the characteristics of the neotectonics. And then, the relation between neotectonic movement and landform development was analyzed by dividing the landform types. At last, the spatial variation of landform evolution was analyzed by extracting the Hypsometric Integral of sub-catchments. The Sancha river catchment's neotectonic movement presents the tilt-lift of earth's crust from NW to SE, which is characterized by the posthumous activity of Yanshan tectonic deformation. The spatial distribution of river terraces indicates that Sancha river catchment has experienced at least four intermittent uplifts and the fault blocks at both the sides of Liuzhi-Zhijin basement fault have differentially uplifted since the late Pleistocene. As the resurgence of Liuzhi-Zhijin basement fault, the Sancha river catchment was broken into two relative independent landform units. The spatial variations of the landform types near the Sancha river and the sub-catchments' landform evolution are characterized by periodic replacement. The styles of geological structure have controlled the development of landform far away from the Sancha River and influenced the landform evolution. The posthumous activities of the secondary structure have resulted in the spatial variation of sub-catchments' landform evolution, which presents periodic replacement with local exceptions. The present study suggests that spatial variations of the development and evolution of modern landform of Sancha River catchment owe their genesis to the interplay between the hydrodynamic force and tectonic activity in the neotectonic period. Likewise, the application of geomorphic indicators also provides a new way to assess the regional crustal stability.

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“…The seismic moment released by the Tangshan mainshock with right-lateral strike slip accounts for 82.3% of the total seismic moment. The rupture model indicates the tectonic stress in North China with the NEE-SWW compressive stress and the NW-SE tensional stress (Wan, 2010;Huang and Wan, 2015;Yang et al, 2016), which is the cause of the Tangshan mainshock. In addition, the Luanxian earthquake and the Ninghe earthquake show a certain normal fault component, which indicates that the deformation mode in Tangshan is a strike slip with partial torsional property.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Rupture Distribution of the 1976 Tangshan Earthquake Sequence Inverted From Geodetic Data

Wan

Yong-Kui

Zhi-Tong

et al. 2017

Chinese J of Geophysics

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The Tangshan 1976 M 7.8 earthquake was followed by two large aftershocks (the Luanxian M 7.1 earthquake and the Ninghe M 6.9 earthquake). The earthquake sequence occurred in an area with good geodetic observation, and the horizontal and vertical co-seismic displacements were obtained by triangulation net and leveling net. In this study, by using raw leveling data (not the subsidence image processed from raw leveling data) and triangulation observation data, we obtain the rupture distribution of strike slip and dip slip component on seismogenic faults. The geometry and size of the seismic faults of the Luanxian and Ninghe earthquake are considered in our model construction. The result shows that the seismic fault of the Tangshan mainshock manifested right-lateral strike slip with a maximum value greater than 6 m in the southern segment. The strike slip component on the northern segment is much less than that of the southern segment. The total seismic moment of the Tangshan mainshock is 2.58×10 20 N·m, which is consistent with that determined by seismic waves. The seismic fault of the Luanxian earthquake shows as a left-lateral normal fault with total moment of 4.95×10 19 N·m. The seismic fault of the Ninghe earthquake shows as a left-lateral normal fault with total moment of 3.94×10 19 N·m, which is an order of magnitude greater than the moment determined by seismic waveform. It is so inferred that the aseismic slip of the Tangshan earthquake occurred on the western part of the Ninghe earthquake fault, demonstrated nearly normal fault property, which is of great significances for geodynamic process and mechanism of aftershock occurrence after the Tangshan earthquake.

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Contemporary tectonic stress field in China

Cited by 31 publications

References 29 publications

Regional stress field around the Taigu fault zone in Shanxi Province, China

Regional stress field around the Taigu fault zone in Shanxi Province, China

The development and evolution of landform based on neotectonic movement: The Sancha river catchment in the southwestern China

Rupture Distribution of the 1976 Tangshan Earthquake Sequence Inverted From Geodetic Data

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