气候变化领域集成服务门户(CCPortal): Three-dimensional density distribution and earthquake activity of the northern Lancangjiang fault in eastern Tibet

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DOI	10.1016/j.tecto.2023.229864
	Three-dimensional density distribution and earthquake activity of the northern Lancangjiang fault in eastern Tibet
	Li, Weiqiang; Yu, Changqing; Zou, Changchun; Zeng, Xiangzhi
发表日期	2023
ISSN	0040-1951
EISSN	1879-3266
卷号	857
英文摘要	Due to the collision and lateral compression of the Indian-Asian plate, the Lancangjiang fault has become one of the most active strike-slip faults in the Qiangtang plate. The Qamdo 2013 Ms6.1 earthquake was induced from the northern section of the fault (the northern Lancangjiang fault). The destruction of the earthquake seriously endangers human activities and the construction of the Sichuan-Tibet Railway. However, there are few high -resolution geophysical data in this area, which limits the understanding of the deep structure, motion mode and seismic activity of the northern Lancangjiang active fault. In this paper, new gravity data were observed at a scale of 1: 200,000, covering an area of 1500km2. Based on wavelet multiscale decomposition, scratch analysis and 3-D inversion of gravity data methods, we obtained gravity anomalies of different scales, faults distribution and density structure. The results show that the overall crustal density change in Qamdo area is obvious and closely related to the distribution of faults. The Qamdo earthquake occurred at the layered interface with steep density change and the result from scratch analysis shows that the stress is concentrated at this position. We believe that the existence of stratigraphic density difference leads to different ability of strata to withstand regional tectonic stress, which is an important cause of the Qamdo earthquake. We analyzed the differences magnitude of earthquake activity between the northern Lancangjiang fault and Kamaduo-Gangtuo fault and believe that the northern Lancangjiang fault is more conducive to the preparation of large earthquakes. Otherwise, this paper provides geophysical evidence for the hypothesis that the northern Lancangjiang fault thrusts to the Qamdo Basin at a high angle.
关键词	Tibetan Plateau The northern Lancangjiang fault Tectonic edge detection Density distribution Earthquake activity
英文关键词	GRAVITY-ANOMALIES; XIANSHUIHE FAULT; 3-D INVERSION; NOISE; CRUST; AREA
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000998612400001
来源期刊	TECTONOPHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283163
作者单位	China University of Geosciences - Beijing; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Li, Weiqiang,Yu, Changqing,Zou, Changchun,et al. Three-dimensional density distribution and earthquake activity of the northern Lancangjiang fault in eastern Tibet[J],2023,857.
APA	Li, Weiqiang,Yu, Changqing,Zou, Changchun,&Zeng, Xiangzhi.(2023).Three-dimensional density distribution and earthquake activity of the northern Lancangjiang fault in eastern Tibet.TECTONOPHYSICS,857.
MLA	Li, Weiqiang,et al."Three-dimensional density distribution and earthquake activity of the northern Lancangjiang fault in eastern Tibet".TECTONOPHYSICS 857(2023).