Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 11, Pages 4343-4349Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063802
Keywords
earthquake rupture; Bartlett Springs Fault; northern San Andreas system; aseismic creep; fault friction; dynamic modeling
Categories
Funding
- Pacific Earthquake Engineering Research Institute
- USGS-PGE CRADA
- National Science Foundation Earth Science Postdoctoral Fellowship [EAR-PF-1250143]
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The Bartlett Springs Fault (BSF), the easternmost branch of the northern San Andreas Fault system, creeps along much of its length. Geodetic data for the BSF are sparse, and surface creep rates are generally poorly constrained. The two existing geodetic slip rate inversions resolve at least one locked patch within the creeping zones. We use the 3-D finite element code FaultMod to conduct dynamic rupture models based on both geodetic inversions, in order to determine the ability of rupture to propagate into the creeping regions, as well as to assess possible magnitudes for BSF ruptures. For both sets of models, we find that the distribution of aseismic creep limits the extent of coseismic rupture, due to the contrast in frictional properties between the locked and creeping regions.
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