气候变化领域集成服务门户(CCPortal): Rupture Dynamics of the 2012 Nicoya Mw 7.6 Earthquake: Evidence for Low Strength on the Megathrust

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DOI	10.1029/2020GL087508
	Rupture Dynamics of the 2012 Nicoya Mw 7.6 Earthquake: Evidence for Low Strength on the Megathrust
	Yao S.; Yang H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:13
英文摘要	Frictional properties on subduction interfaces are essential for understanding earthquake nucleation, rupture propagation, and tsunami generation during megathrust earthquakes. Because they cannot be directly observed, they have been inferred from different approaches. However, none of them have reported constraints immediately before a megathrust earthquake. Here we quantify the frictional strength on the megathrust prior to the 2012 Mw 7.6 Nicoya earthquake by conducting spontaneous rupture simulations with constraints from near-field observations. Our preferred dynamic rupture model shows a remarkable fit on the near-field data. The simulation results indicate an average strength drop of <5 MPa. Considering typical ranges for the dynamic friction coefficient fd ≤ 0.2 and the static friction coefficient fs = 0.6, we infer that the average strength on the megathrust is ≤7.5 MPa. Such low strength is attributed to the near-lithostatic pore pressure along the subduction interface, which is implied by seismic studies in this region. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Stiction; Dynamic friction coefficient; Dynamic rupture models; Earthquake nucleation; Frictional properties; Frictional strength; Megathrust earthquakes; Static friction coefficient; Subduction interface; Earthquakes; crack propagation; earthquake event; earthquake rupture; friction; pore pressure; subduction; thrust fault; tsunami event
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170150
作者单位	Earth System Science Programme, The Chinese University of Hong Kong, Shatin, Hong Kong
推荐引用方式 GB/T 7714	Yao S.,Yang H.. Rupture Dynamics of the 2012 Nicoya Mw 7.6 Earthquake: Evidence for Low Strength on the Megathrust[J],2020,47(13).
APA	Yao S.,&Yang H..(2020).Rupture Dynamics of the 2012 Nicoya Mw 7.6 Earthquake: Evidence for Low Strength on the Megathrust.Geophysical Research Letters,47(13).
MLA	Yao S.,et al."Rupture Dynamics of the 2012 Nicoya Mw 7.6 Earthquake: Evidence for Low Strength on the Megathrust".Geophysical Research Letters 47.13(2020).