气候变化领域集成服务门户(CCPortal): Repeating Earthquakes With Remarkably Repeatable Ruptures on the San Andreas Fault at Parkfield

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DOI	10.1029/2020GL089820
	Repeating Earthquakes With Remarkably Repeatable Ruptures on the San Andreas Fault at Parkfield
	Abercrombie R.E.; Chen X.; Zhang J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	We calculate rupture directivity and velocity for earthquakes in three well-recorded repeating sequences (2001–2016) on the San Andreas Fault at Parkfield using P waves from borehole recordings and the empirical Green's function method. The individual events in each sequence all show the same directivity; the largest magnitude sequence (M ~ 2.7, 8 events) ruptures unilaterally NW (at ~0.8Vs), the second sequence (M ~ 2.3, 9 events) ruptures unilaterally SE, and the smallest magnitude sequence (M ~ 2, 11 events) is less well resolved. The highly repetitive rupture suggests that geometry or material properties might control nucleation of small locked patches. The source spectra of the M ~ 2.7 sequence exhibit no detectable temporal variation. The smaller M sequences both exhibit a decrease in high-frequency energy following the M6 earthquake that recovers with time. This could indicate a decrease in stress drop, an increase in attenuation, or a combination of the two, followed by gradual healing. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Seismic waves; Strike-slip faults; Borehole recordings; Empirical green's functions; High frequency HF; Repeating earthquake; Rupture directivity; San Andreas fault; Stress drop; Temporal variation; Earthquakes; borehole logging; earthquake event; earthquake rupture; geometry; nucleation; P-wave; San Andreas Fault; spectral analysis; California; Parkfield; San Andreas; United States
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/169317
作者单位	Department of Earth and Environment, Boston University, Boston, MA, United States; School of Geosciences, University of Oklahoma, Norman, OK, United States
推荐引用方式 GB/T 7714	Abercrombie R.E.,Chen X.,Zhang J.. Repeating Earthquakes With Remarkably Repeatable Ruptures on the San Andreas Fault at Parkfield[J],2020,47(23).
APA	Abercrombie R.E.,Chen X.,&Zhang J..(2020).Repeating Earthquakes With Remarkably Repeatable Ruptures on the San Andreas Fault at Parkfield.Geophysical Research Letters,47(23).
MLA	Abercrombie R.E.,et al."Repeating Earthquakes With Remarkably Repeatable Ruptures on the San Andreas Fault at Parkfield".Geophysical Research Letters 47.23(2020).