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Aftershocks driven by afterslip and fluid pressure sweeping through a fault-fracture mesh

Ross, Zachary E. and Rollins, Christopher and Cochran, Elizabeth S. and Hauksson, Egill and Avouac, Jean-Philippe and Ben-Zion, Yehuda (2017) Aftershocks driven by afterslip and fluid pressure sweeping through a fault-fracture mesh. Geophysical Research Letters, 44 (16). pp. 8260-8267. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20170808-080406085

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Abstract

A variety of physical mechanisms are thought to be responsible for the triggering and spatiotemporal evolution of aftershocks. Here we analyze a vigorous aftershock sequence and postseismic geodetic strain that occurred in the Yuha Desert following the 2010 M_w 7.2 El Mayor-Cucapah earthquake. About 155,000 detected aftershocks occurred in a network of orthogonal faults and exhibit features of two distinct mechanisms for aftershock triggering. The earliest aftershocks were likely driven by afterslip that spread away from the main shock with the logarithm of time. A later pulse of aftershocks swept again across the Yuha Desert with square root time dependence and swarm-like behavior; together with local geological evidence for hydrothermalism, these features suggest that the events were driven by fluid diffusion. The observations illustrate how multiple driving mechanisms and the underlying fault structure jointly control the evolution of an aftershock sequence.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/2017GL074634DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2017GL074634/abstractPublisherArticle
ORCID:
AuthorORCID
Ross, Zachary E.0000-0002-6343-8400
Rollins, Christopher0000-0002-5291-6956
Cochran, Elizabeth S.0000-0003-2485-4484
Hauksson, Egill0000-0002-6834-5051
Avouac, Jean-Philippe0000-0002-3060-8442
Ben-Zion, Yehuda0000-0002-9602-2014
Additional Information:© 2017 American Geophysical Union. Received 17 JUN 2017; Accepted 2 AUG 2017; Accepted article online 7 AUG 2017; Published online 19 AUG 2017. We thank the field teams from UC Riverside and UC Santa Barbara who installed the temporary stations in the Yuha Desert. The paper benefitted from constructive comments by two anonymous reviewers and Shiqing Xu. All waveform data used are available at the Southern California Earthquake Data Center (scedc.caltech.edu), and all GPS data used are available at SOPAC (sopac.ucsd.edu). The earthquake catalog produced is available in supporting information as Data Set S1. This research was supported by USGS/NEHRP grant G16AP00147; NSF awards: EAR-1550704 and EAR-1551411; and by the Southern California Earthquake Center, which is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12 AC20038.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGSG16AP00147
NSFEAR-1550704
NSFEAR-1551411
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-1033462
USGSG12AC20038
Subject Keywords:Ross Z. E., C. Rollins, E. S. Cochran, E. Hauksson, J.-P. Avouac, and Y. Ben-Zion (2017), Aftershocks driven by afterslip and fluid pressure sweeping through a fault-fracture mesh, Geophys. Res. Lett., 44, doi:10.1002/2017GL074634
Record Number:CaltechAUTHORS:20170808-080406085
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170808-080406085
Official Citation:Ross Z. E., C. Rollins, E. S. Cochran, E. Hauksson, J.-P. Avouac, and Y. Ben-Zion (2017), Aftershocks driven by afterslip and fluid pressure sweeping through a fault-fracture mesh, Geophys. Res. Lett., 44, 8260–8267, doi:10.1002/2017GL074634
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79905
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Aug 2017 16:32
Last Modified:05 Oct 2017 21:44

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