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Fortnightly modulation of San Andreas tremor and low-frequency earthquakes [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 8,601-8,605 : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Earth tides modulate tremor and low-frequency earthquakes (LFEs) on faults in the vicinity of the brittle-ductile (seismic-aseismic) transition. Our response to the tidal stress carries otherwise inaccessible information about fault strength and rheology. We analyze the LFE response to the fortnightly tide, which modulates the amplitude of the daily tidal stress over a 14-d cycle. LFE rate is highest during the waxing fortnightly tide, with LFEs most strongly promoted when the daily stress exceeds the previous peak stress by the widest margin. This pattern implies a threshold failure process, with slip initiated when stress exceeds the local fault strength. Furthermore, variations in sensitivity to the fortnightly modulation may reflect the degree of stress concentration on LFE-producing brittle asperities embedded within an otherwise aseismic fault.
Report Numbers
E 1.99:la-ur--15-27728
la-ur--15-27728
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Note
Published through SciTech Connect.
07/18/2016.
"la-ur--15-27728"
Proceedings of the National Academy of Sciences of the United States of America 113 31 ISSN 0027-8424 AM
Nicholas J. van der Elst; Andrew A. Delorey; David R. Shelly; Paul A. Johnson.
Funding Information
AC52-06NA25396
View MARC record | catkey: 23782848