气候变化领域集成服务门户(CCPortal): Geodetic source models of the 2016-2022 Menyuan Earthquake sequence (Northeastern Tibet) inferred from InSAR and optical observations

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DOI	10.1093/gji/ggad429
	Geodetic source models of the 2016-2022 Menyuan Earthquake sequence (Northeastern Tibet) inferred from InSAR and optical observations
	He, Lijia; Feng, Guangcai; Wang, Yuedong; Xiong, Zhiqiang; Gao, Hua; Liu, Xiaoge
发表日期	2023
ISSN	0956-540X
EISSN	1365-246X
起始页码	470
结束页码	479
卷号	236 期号:1
英文摘要	We study the 2016 January 21 (${{{M}}}_{\rm{w}}$ 5.9) and 2022 January 8 (${{{M}}}_{\rm{w}}$ 6.7) earthquake sequence that struck the Menyuan region in northwest China's Qinghai province. These two earthquakes are destructive events that occurred around/on the Lenglongling fault (LLLF). Here, we derive the line-of-sight displacement fields of the two earthquakes using Interferometric Synthetic Aperture Radar (InSAR) measurements of Sentinel-1 SAR data, and map the range and horizontal offset fields of the 2022 event using Sentinel-1 amplitude images and Planet-Lab optical images. Based on the offset maps, we determine the detailed surface rupture trace of the 2022 event. We perform slip inversions for the two earthquakes on triangle fault patches whose size increases with depth. Results show that the western branch segment of the 2022 event has a similar to 0.5-m normal dip-slip motion. This result contradicts previous inferences on dip-slip sense of this branch segment. We identify a left-stepping fault structure with a similar to 5-km step width in the transition zone between the Tuolaishan fault (TLSF) and LLLF, which may serve as a kinematic barrier to prevent further propagation of seismic rupture along the TLSF. Stress calculation shows that a stress drop of similar to 0.4 bar produced by the 2016 event on a similar to 5-km long LLLF segment may act as a negative stress barrier to suppress rupture propagation of the 2022 event toward the southeast of the LLLF.
关键词	Radar interferometry Satellite geodesy Joint inversion Earthquake ground motions Kinematics of crustal and mantle deformation
英文关键词	2008 WENCHUAN EARTHQUAKE; COSEISMIC DISPLACEMENTS; SLIP DISTRIBUTION; STRESS TRANSFER; DEFORMATION; FIELD; CALIFORNIA; FAULTS; IMAGES; RADAR
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001108126900003
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283493
作者单位	Central South University; Central South University; China University of Geosciences - Beijing; Jiangxi Normal University; Chengdu University of Technology
推荐引用方式 GB/T 7714	He, Lijia,Feng, Guangcai,Wang, Yuedong,et al. Geodetic source models of the 2016-2022 Menyuan Earthquake sequence (Northeastern Tibet) inferred from InSAR and optical observations[J],2023,236(1).
APA	He, Lijia,Feng, Guangcai,Wang, Yuedong,Xiong, Zhiqiang,Gao, Hua,&Liu, Xiaoge.(2023).Geodetic source models of the 2016-2022 Menyuan Earthquake sequence (Northeastern Tibet) inferred from InSAR and optical observations.GEOPHYSICAL JOURNAL INTERNATIONAL,236(1).
MLA	He, Lijia,et al."Geodetic source models of the 2016-2022 Menyuan Earthquake sequence (Northeastern Tibet) inferred from InSAR and optical observations".GEOPHYSICAL JOURNAL INTERNATIONAL 236.1(2023).