气候变化领域集成服务门户(CCPortal): Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal

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DOI	10.1029/2019JB019201
	Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal
	Ingleby T.; Wright T.J.; Hooper A.; Craig T.J.; Elliott J.R.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	The geometry and frictional properties of a fault system are key parameters required to understand its seismic behavior. The Main Himalayan Thrust in Nepal is the type example of a continental megathrust and forms part of a fault system which accommodates a significant fraction of India-Eurasia convergence. Despite extensive study of this zone of shortening, the geometry of the fault system remains controversial. Here, we use interseismic, coseismic, and postseismic geodetic data in Nepal to investigate the proposed downdip geometries. We use interseismic and coseismic data from previous studies, acquired before and during the 2015 (Formula presented.) 7.8 Gorkha earthquake. We then supplement these by processing our own postseismic deformation data, acquired following the Gorkha earthquake. We find that kinematic modeling of geodetic data alone cannot easily distinguish between the previously proposed geometries. We therefore develop a mechanical joint coseismic-postseismic slip inversion which simultaneously solves for the distribution of coseismic slip and rate-strengthening friction parameters. We run this inversion using the proposed geometries and find that they are all capable of explaining the majority of geodetic data. We find values for the rate parameter, (Formula presented.), from the rate-and-state friction law that are between 0.8 and (Formula presented.), depending on the geometry used. These values are in agreement with results from laboratory studies and those inferred from other earthquakes. We suggest that the limitations of earthquake cycle geodesy partly explain the continued controversy over the geometry and role of various faults in the Nepal Himalaya. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	friction; geodesy; geometry; Nepal; postseismic
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187958
作者单位	COMET, School of Earth and Environment, University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Ingleby T.,Wright T.J.,Hooper A.,et al. Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal[J],2020,125(2).
APA	Ingleby T.,Wright T.J.,Hooper A.,Craig T.J.,&Elliott J.R..(2020).Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Ingleby T.,et al."Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal".Journal of Geophysical Research: Solid Earth 125.2(2020).