Document Detail


Dilational processes accompanying earthquakes in the long valley caldera
MedLine Citation:
PMID:  10753113     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Regional distance seismic moment tensor determinations and broadband waveforms of moment magnitude 4.6 to 4.9 earthquakes from a November 1997 Long Valley Caldera swarm, during an inflation episode, display evidence of anomalous seismic radiation characterized by non-double couple (NDC) moment tensors with significant volumetric components. Observed coseismic dilation suggests that hydrothermal or magmatic processes are directly triggering some of the seismicity in the region. Similarity in the NDC solutions implies a common source process, and the anomalous events may have been triggered by net fault-normal stress reduction due to high-pressure fluid injection or pressurization of fluid-saturated faults due to magmatic heating.
Authors:
Dreger; Tkalcic; Johnston
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  288     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-04-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  Eng     Pagination:  122-5     Citation Subset:  -    
Affiliation:
Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA. U.S. Geological Survey, Menlo Park, CA 94025, USA.
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