气候变化领域集成服务门户(CCPortal): Coseismic Rupture Behaviors of the January and March 2022 MW > 5.5 Hala Lake Earthquakes, NE Tibet, Constrained by InSAR Observations

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DOI	10.3390/rs15041124
	Coseismic Rupture Behaviors of the January and March 2022 MW > 5.5 Hala Lake Earthquakes, NE Tibet, Constrained by InSAR Observations
	Yang, Jiuyuan; Xu, Caijun; Wen, Yangmao
发表日期	2023
EISSN	2072-4292
卷号	15 期号:4
英文摘要	On 23 January and 25 March 2022, two M-W > 5.5 Hala Lake earthquakes characterized by right-lateral strike-slip faulting occurred around the Elashan Fault in Northeastern Tibet, marking the two largest events since the 1927 M-W 6.2 Hala Lake earthquake. Since no surface rupture related to the two earthquakes has been reported, the seismogenic faults and coseismic rupture behaviors of the two events are still unknown. The occurrence of the two events provides a rare opportunity to gain insight into the seismogenic structure and rupture behavior of the less studied region, further helping us accurately evaluate the regional seismic hazard. Here, we first exploit Interferometric synthetic aperture radar (InSAR) data to obtain the coseismic deformation associated with the two earthquakes and then invert for the fault geometry and detailed coseismic slip of the two events. Coseismic modeling reveals that the January and March 2022 earthquakes ruptured two buried west-dipping moderate-angle and high-angle right-lateral strike-slip faults, respectively. Most of the slip of the January event occurred at depths from 1.7-7.6 km, while the majority of the slip associated with the March event occurred at depths from 2.5-10 km, which may have been restricted by the intersections between the January and March Hala Lake seismogenic faults. By a comprehensive analysis of the coseismic inversions, stress changes, and early postseismic signal, we suggest that the significant fault dip difference (similar to 30 degrees), highlighting a fault segmentation, stops the rupture propagation from one fault segment to another and that fluid migration may encourage the restart of the rupture of the later event, which requires further investigation. Moreover, Coulomb stress modeling shows stress loading on the eastern segment of the Daxueshan-Shule Fault and the northern segment of the Elashan fault, which we should pay more attention to.
关键词	Hala Lake earthquake InSAR coseismic deformation buried strike-slip fault coulomb stress
英文关键词	SATELLITE RADAR INTERFEROMETRY; FAULT SYSTEM; STRESS CHANGES; STRIKE-SLIP; DISPLACEMENT; DEFORMATION; SEISMICITY; OBLIQUE; MARGIN; RATES
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000941712400001
来源期刊	REMOTE SENSING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283305
作者单位	Wuhan University; Wuhan University
推荐引用方式 GB/T 7714	Yang, Jiuyuan,Xu, Caijun,Wen, Yangmao. Coseismic Rupture Behaviors of the January and March 2022 MW > 5.5 Hala Lake Earthquakes, NE Tibet, Constrained by InSAR Observations[J],2023,15(4).
APA	Yang, Jiuyuan,Xu, Caijun,&Wen, Yangmao.(2023).Coseismic Rupture Behaviors of the January and March 2022 MW > 5.5 Hala Lake Earthquakes, NE Tibet, Constrained by InSAR Observations.REMOTE SENSING,15(4).
MLA	Yang, Jiuyuan,et al."Coseismic Rupture Behaviors of the January and March 2022 MW > 5.5 Hala Lake Earthquakes, NE Tibet, Constrained by InSAR Observations".REMOTE SENSING 15.4(2023).