气候变化领域集成服务门户(CCPortal): Depth Constraints on Coseismic Velocity Changes From Frequency-Dependent Measurements of Repeating Earthquake Waveforms

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DOI	10.1029/2020JB020421
	Depth Constraints on Coseismic Velocity Changes From Frequency-Dependent Measurements of Repeating Earthquake Waveforms
	Sheng Y.; Ellsworth W.L.; Lellouch A.; Beroza G.C.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	We revisit velocity changes caused by the 2004 Parkfield earthquake through the analysis of the coda of repeating earthquakes. Our results reveal the change to be strongly frequency dependent. Low-frequency components of the coda of repeating earthquakes are more affected by the velocity alteration than high-frequency components. We interpret this to indicate that the coseismic velocity reduction primarily occurs at a shallow depth, and is expressed in low-frequency energy resulting from reverberations near the Earth's surface. This can only be observed at low frequencies because the shallow crust is highly dissipative. The high-frequency component is relatively unaffected, as it is comprised of body waves scattered throughout the crust. We support this argument with direct observations of seismic wavefields across a wide range of depths in the shallow crust, supplemented by using downhole geophones and distributed acoustic sensing measurements. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	coda of repeating earthquakes; downhole geophones and DAS; frequency-dependent coseismic velocity change; near-surface seismic reverberations; shallow coseismic material damage and postseismic healing
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/187380
作者单位	Department of Geophysics, Stanford University, Stanford, CA, United States; Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS, Grenoble, France
推荐引用方式 GB/T 7714	Sheng Y.,Ellsworth W.L.,Lellouch A.,et al. Depth Constraints on Coseismic Velocity Changes From Frequency-Dependent Measurements of Repeating Earthquake Waveforms[J],2021,126(2).
APA	Sheng Y.,Ellsworth W.L.,Lellouch A.,&Beroza G.C..(2021).Depth Constraints on Coseismic Velocity Changes From Frequency-Dependent Measurements of Repeating Earthquake Waveforms.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Sheng Y.,et al."Depth Constraints on Coseismic Velocity Changes From Frequency-Dependent Measurements of Repeating Earthquake Waveforms".Journal of Geophysical Research: Solid Earth 126.2(2021).