气候变化领域集成服务门户(CCPortal): Data-Driven Two-Fault Modeling of the Mw 6.0 2008 Wells, Nevada Earthquake Suggests a Listric Fault Rupture

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DOI	10.1029/2020JB020263
	Data-Driven Two-Fault Modeling of the Mw 6.0 2008 Wells, Nevada Earthquake Suggests a Listric Fault Rupture
	Frietsch M.; Ferreira A.M.G.; Funning G.J.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	Structural fault complexity at depth affects seismic hazard, earthquake physics, and regional tectonic behavior, but constraining such complexity is challenging. We present earthquake source models of the February 21, 2008, Mw 6.0 Wells event that occurred in the Basin and Range in the western USA, suggesting the rupture of both the shallow and deep parts of a listric fault. We use a large data set including 150 local seismic waveforms from the USArray combined with high-quality Interferometric Synthetic Aperture Radar and teleseismic waveforms. Rather than imposing an a priori fault geometry in the source inversions, as is often done in the literature, we use a data-driven approach whereby all the faulting parameters and number of faults are determined by the data alone. We find a two-fault normal faulting solution comprising: (i) a shallow (centroid depth ∼4.6 km) sub-event with Mw 5.3 and fault dip of ∼77°; and (ii) a deeper (centroid depth ∼8.8 km), larger Mw 6.0 sub-event on a fault with shallower dip angle (∼41°). Our preferred two-fault model is consistent with aftershocks and with the tectonics of the region. The local USArray waveforms used in the modeling are key to detect the rupture of both shallow and deep parts of the possible listric fault. The lack of such dense and uniform coverage of earthquakes in other regions on Earth may explain why the full seismic rupture of listric faults may have gone undetected in the past. Thus, earthquake slip on whole listric faults may be more common than previously thought. © 2021. The Authors.
英文关键词	Basin and Range; listric fault; multiple fault modeling; USArray; Western US
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/187190
作者单位	Department of Earth Sciences, University College London, London, United Kingdom; Now at Geophysical Institute (GPI), Karlsruhe Institute of Technology, Karlsruhe, Germany; CERIS, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal; Department of Earth and Planetary Sciences, University of California, Riverside, CA, United States
推荐引用方式 GB/T 7714	Frietsch M.,Ferreira A.M.G.,Funning G.J.. Data-Driven Two-Fault Modeling of the Mw 6.0 2008 Wells, Nevada Earthquake Suggests a Listric Fault Rupture[J],2021,126(4).
APA	Frietsch M.,Ferreira A.M.G.,&Funning G.J..(2021).Data-Driven Two-Fault Modeling of the Mw 6.0 2008 Wells, Nevada Earthquake Suggests a Listric Fault Rupture.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Frietsch M.,et al."Data-Driven Two-Fault Modeling of the Mw 6.0 2008 Wells, Nevada Earthquake Suggests a Listric Fault Rupture".Journal of Geophysical Research: Solid Earth 126.4(2021).