气候变化领域集成服务门户(CCPortal): Elastic strain energy and pore-fluid pressure control of aftershocks

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DOI	10.1016/j.epsl.2020.116103
	Elastic strain energy and pore-fluid pressure control of aftershocks
	Terakawa T.; Matsu'ura M.; Noda A.
发表日期	2020
ISSN	0012821X
卷号	535
英文摘要	Aftershocks are well-known, however their triggering mechanisms remain unclear. The Coulomb failure stress change (ΔCFS) has been widely implemented to understand the spatial distribution of aftershocks. Here we propose a new metric for evaluating aftershock generation based on the energetics of shear faulting in a prestressed state. Unlike ΔCFS, the new metric depends not only on coseismic stress changes but also on background crustal stresses. The energetics-based formulation expands the ΔCFS defined on a specific plane into a generalized failure stress defined in a three-dimensional space. We examined the diagnostic ability of the new metric by applying receiver operating characteristic analysis to 12,175 aftershocks (M≥0) that followed the 1992 Landers earthquake. With a realistic background stress field inferred from thousands of earthquake focal mechanisms, the new metric was able to discriminate the triggering mechanisms of the aftershocks: two-thirds were direct responses to coseismic stress changes and one-fifth resulted from strength decreases owing to pore-fluid pressure increases. © 2020 Elsevier B.V.
关键词	background stress earthquake generation elastic strain energy Landers earthquake pore-fluid pressure ROC analysis
英文关键词	Strain energy; Coulomb failure stress; Earthquake focal mechanisms; Elastic strain energy; Pore fluid pressure; Receiver operating characteristic analysis; ROC analysis; Three dimensional space; Triggering mechanism; Earthquakes; aftershock; coseismic process; Coulomb criterion; elastic wave; focal mechanism; Landers earthquake 1992; pore pressure; spatial distribution; strain analysis; stress analysis; trigger mechanism; California; Landers; United States
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202932
作者单位	Graduate School of Environmental Studies, Nagoya University, D2-2 (510) Furo-cho, Nagoya, Chikusa-ku 464-8601, Japan; Institute of Statistical Mathematics, 10-3 Midori-cho, Tokyo, Tachikawa 190-8562, Japan; National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Ibaraki, Tsukuba 305-0006, Japan
推荐引用方式 GB/T 7714	Terakawa T.,Matsu'ura M.,Noda A.. Elastic strain energy and pore-fluid pressure control of aftershocks[J],2020,535.
APA	Terakawa T.,Matsu'ura M.,&Noda A..(2020).Elastic strain energy and pore-fluid pressure control of aftershocks.Earth and Planetary Science Letters,535.
MLA	Terakawa T.,et al."Elastic strain energy and pore-fluid pressure control of aftershocks".Earth and Planetary Science Letters 535(2020).