GSTDTAP  > 气候变化
DOI10.1029/2019GL083725
Pervasive Foreshock Activity Across Southern California
Trugman, Daniel T.1; Ross, Zachary E.2
2019-08-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2019
卷号46期号:15页码:8772-8781
文章类型Article
语种英语
国家USA
英文摘要

Foreshocks have been documented as preceding less than half of all mainshock earthquakes. These observations are difficult to reconcile with laboratory earthquake experiments and theoretical models of earthquake nucleation, which both suggest that foreshock activity should be nearly ubiquitous. Here we use a state-of-the-art, high-resolution earthquake catalog to study foreshock sequences of magnitude M4 and greater mainshocks in southern California from 2008-2017. This highly complete catalog provides a new opportunity to examine smaller magnitude precursory seismicity. Seventy-two percent of mainshocks within this catalog are preceded by foreshock activity that is significantly elevated compared to the local background seismicity rate. Foreshock sequences vary in duration from several days to weeks, with a median of 16.6 days. The results suggest that foreshock occurrence in nature is more prevalent than previously thought and that our understanding of earthquake nucleation may improve in tandem with advances in our ability to detect small earthquakes.


Plain Language Summary Earthquakes often occur without warning or detectable precursors. Here we use a new, highly complete earthquake catalog to show that most mainshock earthquakes in southern California are preceded by elevated seismicity rates-foreshocks-in the days and weeks leading up to the event. Many of these foreshock earthquakes are small in magnitude and hence were previously undetected by the seismic network. These observations help bridge the gap between observations of real earth fault systems and laboratory earthquake experiments, where foreshock occurrence is commonly observed.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000483812500020
WOS关键词STRESS CHANGES ; EARTHQUAKE ; MAGNITUDE ; SEQUENCES ; AFTERSHOCKS ; SEISMICITY ; FREQUENCY ; AFTERSLIP
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
被引频次:69[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/186026
专题气候变化
作者单位1.Los Alamos Natl Lab, Geophys Grp, Earth & Environm Sci Div, Los Alamos, NM 87545 USA;
2.CALTECH, Seismol Lab, Pasadena, CA 91125 USA
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GB/T 7714
Trugman, Daniel T.,Ross, Zachary E.. Pervasive Foreshock Activity Across Southern California[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(15):8772-8781.
APA Trugman, Daniel T.,&Ross, Zachary E..(2019).Pervasive Foreshock Activity Across Southern California.GEOPHYSICAL RESEARCH LETTERS,46(15),8772-8781.
MLA Trugman, Daniel T.,et al."Pervasive Foreshock Activity Across Southern California".GEOPHYSICAL RESEARCH LETTERS 46.15(2019):8772-8781.
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