中国科学院机构知识库网格系统: Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics

Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics

文献类型：期刊论文


作者	Adams, Mareike 1,2; Hao, Jinlai 3; Ji, Chen 1,2
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期	2019-05-01
卷号	217 期号:2 页码:784-797
关键词	Inverse theory Numerical approximations and analysis Numerical modelling Wavelet transform Earthquake dynamics Earthquake source observations
ISSN号	0956-540X
DOI	10.1093/gji/ggz047
英文摘要	The slip and static stress drop of the 2015 M-w 7.8 Gorkha, Nepal earthquake has been studied using its excellent near-source static observations and a newly developed finite fault inversion algorithm with an average stress drop constraint. A series of nonlinear inversions with different target stress drops are conducted to search for the solution that not only most accurately fits the geodetic data, but also has an energy-based stress drop, (Delta) over bar tau(E), matching the target value. Our result reveals that the misfit to the geodetic data gradually decreases when the (Delta) over bar tau(E) of the inverted slip model increases from 2 to 7MPa; but becomes nearly constant when (Delta) over bar tau(E) further increases. Hence, only the lower bound of (Delta) over bar tau(E), that is, (Delta) over bar tau(min)(E) (similar to 7 MPa), of the Gorkha earthquake can be constrained with near-fault geodetic measurements, consistent with our previous study using just far-field seismic data. The upper bound of (Delta) over bar tau(E) can be constrained with an extra constraint on the maximum local stress drop. An artificial upper bound can also be reached if using a large subfault size to represent the source. The lower bound of (Delta) over bar tau(E) leads to the lower bound of the apparent available energy and the upper bound of the radiation efficiency (eta(R), 0.09-0.15), though the latter is also sensitive to the determination of the radiated seismic energy. We find that the lower eta(R) and the reported high rupture velocity (80-93 per cent shear wave speed) can be reconciled by considering the aspect ratio of the dominant slip patch. We recommend using (Delta) over bar tau(min)(E) to replace various slip smoothing constraints to stabilize the finite fault inversion because of its clear physical meaning.
WOS关键词	FAULT SLIP INVERSIONS ; 1979 IMPERIAL-VALLEY ; 1999 HECTOR MINE ; GORKHA EARTHQUAKE ; DOMAIN INVERSION ; SEISMIC MOMENT ; RUPTURE ; CALIFORNIA ; MODELS ; DEFORMATION
资助项目	Southern California Earthquake Center (SCEC) - NSF[7062] ; Southern California Earthquake Center (SCEC) - NSF[EAR-0109624] ; USGS Cooperative Agreement[02HQAG0008] ; National Natural Science Foundation of China[41541033] ; [EAR-1215769]
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000465608000004
出版者	OXFORD UNIV PRESS
资助机构	Southern California Earthquake Center (SCEC) - NSF ; Southern California Earthquake Center (SCEC) - NSF ; USGS Cooperative Agreement ; USGS Cooperative Agreement ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Southern California Earthquake Center (SCEC) - NSF ; Southern California Earthquake Center (SCEC) - NSF ; USGS Cooperative Agreement ; USGS Cooperative Agreement ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Southern California Earthquake Center (SCEC) - NSF ; Southern California Earthquake Center (SCEC) - NSF ; USGS Cooperative Agreement ; USGS Cooperative Agreement ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Southern California Earthquake Center (SCEC) - NSF ; Southern California Earthquake Center (SCEC) - NSF ; USGS Cooperative Agreement ; USGS Cooperative Agreement ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92129]
专题	中国科学院地质与地球物理研究所
通讯作者	Adams, Mareike
作者单位	1.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA 2.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Adams, Mareike,Hao, Jinlai,Ji, Chen. Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2019,217(2):784-797.
APA	Adams, Mareike,Hao, Jinlai,&Ji, Chen.(2019).Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics.GEOPHYSICAL JOURNAL INTERNATIONAL,217(2),784-797.
MLA	Adams, Mareike,et al."Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics".GEOPHYSICAL JOURNAL INTERNATIONAL 217.2(2019):784-797.

入库方式： OAI收割

来源：地质与地球物理研究所

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Energy-based average stress drop and its uncertainty during the 2015 M-w 7.8 Nepal earthquake constrained by geodetic data and its implications to earthquake dynamics

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