Document Detail


Tidal modulation of nonvolcanic tremor.
MedLine Citation:
PMID:  18033849     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Episodes of nonvolcanic tremor and accompanying slow slip recently have been observed in the subduction zones of Japan and Cascadia. In Cascadia, such episodes typically last a few weeks and differ from "normal" earthquakes in their source location and moment-duration scaling. The three most recent episodes in the Puget Sound/southern Vancouver Island portion of the Cascadia subduction zone were exceptionally well recorded. In each episode, we saw clear pulsing of tremor activity with periods of 12.4 and 24 to 25 hours, the same as the principal lunar and lunisolar tides. This indicates that the small stresses associated with the solid-earth and ocean tides influence the genesis of tremor much more effectively than they do the genesis of normal earthquakes. Because the lithostatic stresses are 10(5) times larger than those associated with the tides, we argue that tremor occurs on very weak faults.
Authors:
Justin L Rubinstein; Mario La Rocca; John E Vidale; Kenneth C Creager; Aaron G Wech
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-11-22
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  319     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-01-11     Completed Date:  2008-01-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  186-9     Citation Subset:  -    
Affiliation:
Department of Earth and Space Science, University of Washington, Box 351310, Seattle, WA 98195, USA. justin@ess.washington.edu
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Comment In:
Science. 2008 Jan 11;319(5860):166-7   [PMID:  18187646 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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