气候变化领域集成服务门户(CCPortal): Temporal Seismic Velocity Variations: Recovery Following From the 2019 Mw 7.1 Ridgecrest, California Earthquake

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DOI	10.1029/2020JB021465
	Temporal Seismic Velocity Variations: Recovery Following From the 2019 Mw 7.1 Ridgecrest, California Earthquake
	Boschelli J.; Moschetti M.P.; Sens-Schönfelder C.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	We investigated seismic velocity changes (dv/v) associated with the 2019 Ridgecrest earthquake sequence with high-frequency autocorrelations of ambient seismic noise data. Daily autocorrelation functions were computed for the entirety of 2019 and the first quarter of 2020 for broadband stations within the region, including the temporary broadband stations installed during the aftershock deployment. Travel time shifts in the daily autocorrelation functions, relative to the mean autocorrelation waveform, were computed to produce dv/v time series, which are sensitive to the evolving material properties of the shallow crust surrounding the Ridgecrest fault zone (RFZ). A short-term velocity drop follows the Mw 7.1 earthquake at stations in the vicinity of the rupture surface, while those greater than 50 km away showed no such drop. The maximum, absolute changes in seismic velocity are proportional to the logarithm of distance from the fault rupture and to the peak dynamic strain experienced during the earthquake. Near the areas of the highest coseismic slip within the RFZ, seismic velocities recovered over 3 months. However, in the vicinity of the nearby Garlock fault, where triggered slip manifested, and north of the RFZ, seismic velocities recovered within a month. We interpret the seismic velocity changes and their recovery to be largely due to changes in the physical properties of the shallow crust, such as fault zone damage recovery caused by the earthquake rupture process and in response to the large dynamic stresses of passing seismic waves from the mainshock. Published 2021. This article is a U.S. Government work and is in the public domain in the USA.
英文关键词	ambient noise; passive image interferometry; Ridgecrest; temporal seismic velocity
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/187181
作者单位	Geological Hazards Science Center, U.S. Geological Survey, Golden, CO, United States; Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, MO, United States; Helmholtz Centre Potsdam-GFZ German Research Centre for Geosciences, Potsdam, Germany
推荐引用方式 GB/T 7714	Boschelli J.,Moschetti M.P.,Sens-Schönfelder C.. Temporal Seismic Velocity Variations: Recovery Following From the 2019 Mw 7.1 Ridgecrest, California Earthquake[J],2021,126(4).
APA	Boschelli J.,Moschetti M.P.,&Sens-Schönfelder C..(2021).Temporal Seismic Velocity Variations: Recovery Following From the 2019 Mw 7.1 Ridgecrest, California Earthquake.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Boschelli J.,et al."Temporal Seismic Velocity Variations: Recovery Following From the 2019 Mw 7.1 Ridgecrest, California Earthquake".Journal of Geophysical Research: Solid Earth 126.4(2021).