Document Detail

Annual modulation of triggered seismicity following the 1992 Landers earthquake in California
MedLine Citation:
PMID:  10952308     Owner:  NLM     Status:  Publisher    
The mechanism responsible for the triggering of earthquakes remains one of the least-understood aspects of the earthquake process. The magnitude-7.3 Landers, California earthquake of 28 June 1992 was followed for several weeks by triggered seismic activity over a large area, encompassing much of the western United States. Here we show that this triggered seismicity marked the beginning of a five-year trend, consisting of an elevated microearthquake rate that was modulated by an annual cycle, decaying with time. The annual cycle is mainly associated with several hydrothermal or volcanic regions where short-term triggering was also observed. These data indicate that the Landers earthquake produced long-term physical changes in these areas, and that an environmental source of stress--plausibly barometric pressure--might be responsible for the annual variation.
Gao; Silver; Linde; Sacks
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Publication Detail:
Journal Detail:
Title:  Nature     Volume:  406     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-08-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  ENGLAND    
Other Details:
Languages:  Eng     Pagination:  500-4     Citation Subset:  -    
Department of Terrestrial Magnetism, Carnegie Institution of Washington, DC 20015, USA.
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