气候变化领域集成服务门户(CCPortal): Earthquake Rupture Through a Step-Over Fault System: An Exploratory Numerical Study of the Leech River Fault, Southern Vancouver Island

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DOI	10.1029/2020JB020059
	Earthquake Rupture Through a Step-Over Fault System: An Exploratory Numerical Study of the Leech River Fault, Southern Vancouver Island
	Li G.; Liu Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	The Leech River fault (LRF) zone located on southern Vancouver Island is a major regional seismic source. We investigate potential interactions between earthquake ruptures on the LRF and the neighboring Southern Whidbey Island fault (SWIF), which can be interpreted as a step-over fault system. Using a linear slip-weakening frictional law, we perform 3-D finite-element simulations to study rupture jumping scenarios from the LRF (source fault) to the SWIF (receiver fault), focusing on the influences of the offset distance, fault initial stress level, and fault burial depth. We find a smaller offset distance, a higher initial stress level on either fault, or a shallower fault burial depth will promote rupture jumping. Jumping scenarios can be interpreted as the response of the receiver fault to stress perturbations radiated from the source fault rupture. We demonstrate that the final rupture jumping scenario depends on various parameters, which can be collectively quantified by two keystone variables, the time-averaged over-stressed zone (where shear stress exceeds static frictional strength on the receiver fault) size (Formula presented.) and the receiver fault initial stress level. Specifically, a smaller offset distance, a higher initial shear stress level, or a shallower burial depth will lead to a larger (Formula presented.). The seismic moment on the receiver fault increases with increasing (Formula presented.). When (Formula presented.) reaches the threshold dependent on the receiver fault initial stress level, the rupture becomes breakaway. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	3-D dynamic rupture; fault geometrical complexity; fault step-over; finite-element method; rupture jumping; the Leech River fault zone
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/187525
作者单位	Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada
推荐引用方式 GB/T 7714	Li G.,Liu Y.. Earthquake Rupture Through a Step-Over Fault System: An Exploratory Numerical Study of the Leech River Fault, Southern Vancouver Island[J],2020,125(11).
APA	Li G.,&Liu Y..(2020).Earthquake Rupture Through a Step-Over Fault System: An Exploratory Numerical Study of the Leech River Fault, Southern Vancouver Island.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Li G.,et al."Earthquake Rupture Through a Step-Over Fault System: An Exploratory Numerical Study of the Leech River Fault, Southern Vancouver Island".Journal of Geophysical Research: Solid Earth 125.11(2020).