气候变化领域集成服务门户(CCPortal): Mainshock and Aftershock Sequence Simulation in Geometrically Complex Fault Zones

CCPortal

DOI	10.1029/2020JB020865
	Mainshock and Aftershock Sequence Simulation in Geometrically Complex Fault Zones
	Ozawa S.; Ando R.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Aftershocks seem to be located along the trace of the mainshock fault; however, due to the location error, we do not know their exact location relative to the mainshock fault. Here, we hypothesize that most aftershocks occur on small subsidiary faults instead of the mainshock fault, and they are triggered by the local increase of stress due to the rough geometry of the mainshock fault. To explore this scenario, we perform 2-D earthquake sequence simulations considering a rough main fault and numerous subsidiary faults that obey the rate and state friction law. We show that many aftershocks occur at the side of the main fault, delineating the main fault trace. We also show that the roughness of the main fault decreases the concentration of aftershocks around the tip of the mainshock fault. Our numerical simulation reproduces the Omori-Utsu law for the temporal decay of aftershocks and reveals the log-time expansion of the aftershock zone. The variability of focal mechanisms of aftershocks strongly depends on the friction coefficient. Large aftershocks are limited in the tips of the mainshock fault. This is one of the first earthquake sequence simulations based on the continuum mechanics framework that reproduces realistic spatiotemporal aftershock activities. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	aftershock; earthquake physics; fault roughness; numerical simulation; rate and state friction; seismicity
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/187331
作者单位	Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Ozawa S.,Ando R.. Mainshock and Aftershock Sequence Simulation in Geometrically Complex Fault Zones[J],2021,126(2).
APA	Ozawa S.,&Ando R..(2021).Mainshock and Aftershock Sequence Simulation in Geometrically Complex Fault Zones.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Ozawa S.,et al."Mainshock and Aftershock Sequence Simulation in Geometrically Complex Fault Zones".Journal of Geophysical Research: Solid Earth 126.2(2021).