globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116103
论文题名:
Elastic strain energy and pore-fluid pressure control of aftershocks
作者: Terakawa T.; Matsu'ura M.; Noda A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165310
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Terakawa T.,Matsu'ura M.,Noda A.. Elastic strain energy and pore-fluid pressure control of aftershocks[J]. Earth and Planetary Science Letters,2020-01-01,535
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