Floyd, MA, Walters, RJ, Elliott, JR orcid.org/0000-0003-2957-4596 et al. (9 more authors) (2016) Spatial variations in fault friction related to lithology from rupture and afterslip of the 2014 South Napa, California, earthquake. Geophysical Research Letters, 43 (13). pp. 6808-6816. ISSN 0094-8276
Abstract
Following earthquakes, faults are often observed to continue slipping aseismically. It has been proposed that this afterslip occurs on parts of the fault with rate-strengthening friction that are stressed by the main shock, but our understanding has been limited by a lack of immediate, high-resolution observations. Here we show that the behavior of afterslip following the 2014 South Napa earthquake in California varied over distances of only a few kilometers. This variability cannot be explained by coseismic stress changes alone. We present daily positions from continuous and survey GPS sites that we remeasured within 12 h of the main shock and surface displacements from the new Sentinel-1 radar mission. This unique geodetic data set constrains the distribution and evolution of coseismic and postseismic fault slip with exceptional resolution in space and time. We suggest that the observed heterogeneity in behavior is caused by lithological controls on the frictional properties of the fault plane.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, American Geophysical Union. This is an author produced version of a paper published in Geophysical Research Letters. Uploaded with permission from the publisher. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number NERC No External Reference NERC NE/J01978X/1 NERC NE/K010867/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Jul 2016 10:47 |
Last Modified: | 05 Nov 2017 23:49 |
Published Version: | http://dx.doi.org/10.1002/2016GL069428 |
Status: | Published |
Publisher: | American Geophysical Union (AGU) |
Identification Number: | 10.1002/2016GL069428 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:101918 |