气候变化领域集成服务门户(CCPortal): Seismic Attenuation Monitoring of a Critically Stressed San Andreas Fault

CCPortal

DOI	10.1029/2020GL089201
	Seismic Attenuation Monitoring of a Critically Stressed San Andreas Fault
	Malagnini L.; Parsons T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	We show that seismic attenuation ((Formula presented.)) along the San Andreas fault (SAF) at Parkfield correlates with the occurrence of moderate-to-large earthquakes at local and regional distances. Earthquake-related (Formula presented.) anomalies are likely caused by changes in permeability from dilatant static stress changes, damage by strong shaking from local sources, and pore unclogging/clogging from mobilization of colloids by dynamic strains. We find that, prior to the 2004 M6 Parkfield earthquake, prefailure conditions for some local events of moderate magnitude correspond to positive anomalies of (Formula presented.) on the Pacific side, with local and regional earthquakes producing sharp attenuation reversals. After the 2004 Parkfield earthquake, we see higher (Formula presented.) anomalies along the SAF, but low sensitivity to local and regional earthquakes, probably because the mainshock significantly altered the permeability state of the rocks adjacent to the SAF, and its sensitivity to earthquake-induced stress perturbations. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Strike-slip faults; Dynamic strain; Induced stress; Large earthquakes; Low sensitivity; Regional earthquakes; San Andreas fault; Seismic attenuation; Static stress; Earthquakes; earthquake damage; permeability; San Andreas Fault; seismic attenuation; sensitivity analysis; shock wave; stress field; California; Pacific Coast [North America]; 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/169311
作者单位	Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; United States Geological Survey, Reston, VA, United States
推荐引用方式 GB/T 7714	Malagnini L.,Parsons T.. Seismic Attenuation Monitoring of a Critically Stressed San Andreas Fault[J],2020,47(23).
APA	Malagnini L.,&Parsons T..(2020).Seismic Attenuation Monitoring of a Critically Stressed San Andreas Fault.Geophysical Research Letters,47(23).
MLA	Malagnini L.,et al."Seismic Attenuation Monitoring of a Critically Stressed San Andreas Fault".Geophysical Research Letters 47.23(2020).