气候变化领域集成服务门户(CCPortal): Stress disturbance around Xianshuihe fault zone in the eastern Qinghai-Tibet Plateau and implication for fault stability

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DOI	10.3389/feart.2024.1373353
	Stress disturbance around Xianshuihe fault zone in the eastern Qinghai-Tibet Plateau and implication for fault stability
	Guo, Songfeng; Li, Jinxuan; Qi, Shengwen; Zheng, Bowen; Zhang, Yaguo; Zou, Yu; Zhu, Weiwei; Waqar, Faisal Muhammad; Zada, Khan
发表日期	2024
EISSN	2296-6463
起始页码	12
卷号	12
英文摘要	The Xianshuihe fault zone in the eastern Qinghai-Tibetan Plateau is an important active tectonic boundary. Understanding its stress state is important for characterizing the dynamic evolution of the Qinghai-Tibet Plateau and the mechanism of the frequent occurrence of large earthquakes. Using 30 years of in-situ stress data from the Xianshuihe active fault zone, we statistically analyzed the spatial distribution characteristics of the stress in the region. The study area is generally characterized by a strike-slip stress field. Nevertheless, the stress state is vulnerable to topography and shows high spatial variation near the Earth's surface at a depth of 0-400 m. The local stress near the fault zone varies from the far-field stress. The orientations of the maximum horizontal principal stress possess an elliptical shape around the fault zone, while its magnitudes become hump-like as the distance increases from the fault. The large difference in properties between the fault zone and its adjacent rocks contributes to the differentiation of the direction of the local stress field near the fault. The results allow us to formulate a preliminary hypothesis that a rigid lateral extrusion model may control the nonuniformity of the local stress field in the Xianshuihe fault zone and preferentially interpret the tectonic uplift of the southeastern margin of the Qinghai-Tibet Plateau. Further, the stress accumulation in the shallow crustal regions of the Xianshuihe fault zone is relatively high, indicating that some segments of the fault zone are critically unstable. Kangding area (the Zheduotang segment and the Yalahe segment) and Luhuo segment hold relatively high potential for large earthquakes. The results of this study are of great significance for revealing the mechanism of fault-stress field interactions and for understanding the dynamic evolution mechanism of the uplift of the Qinghai-Tibet Plateau.
英文关键词	Xianshuihe fault zone; stress field; geomechanics; fault stability; Qinghai-Tibet Plateau
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001188363400001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/308219
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chang'an University
推荐引用方式 GB/T 7714	Guo, Songfeng,Li, Jinxuan,Qi, Shengwen,et al. Stress disturbance around Xianshuihe fault zone in the eastern Qinghai-Tibet Plateau and implication for fault stability[J],2024,12.
APA	Guo, Songfeng.,Li, Jinxuan.,Qi, Shengwen.,Zheng, Bowen.,Zhang, Yaguo.,...&Zada, Khan.(2024).Stress disturbance around Xianshuihe fault zone in the eastern Qinghai-Tibet Plateau and implication for fault stability.FRONTIERS IN EARTH SCIENCE,12.
MLA	Guo, Songfeng,et al."Stress disturbance around Xianshuihe fault zone in the eastern Qinghai-Tibet Plateau and implication for fault stability".FRONTIERS IN EARTH SCIENCE 12(2024).