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Evolution of seismicity near the southernmost terminus of the San Andreas Fault: Implications of recent earthquake clusters for earthquake risk in southern California

Hauksson, Egill and Meier, Men-Andrin and Ross, Zachary E. and Jones, Lucile M. (2017) Evolution of seismicity near the southernmost terminus of the San Andreas Fault: Implications of recent earthquake clusters for earthquake risk in southern California. Geophysical Research Letters, 44 (3). pp. 1293-1301. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20170124-110939458

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Abstract

Three earthquake clusters that occurred in the direct vicinity of the southern terminus of the San Andreas Fault (SAF) in 2001, 2009, and 2016 raised significant concern regarding possible triggering of a major earthquake on the southern SAF, which has not ruptured in more than 320 years. These clusters of small and moderate earthquakes with M ≤ 4.8 added to an increase in seismicity rate in the northern Brawley seismic zone that began after the 1979 M_w 6.5 Imperial Valley earthquake, in contrast to the quiet from 1932 to 1979. The clusters so far triggered neither small nor large events on the SAF. The mostly negative Coulomb stress changes they imparted on the SAF may have reduced the likelihood that the events would initiate rupture on the SAF, although large magnitude earthquake triggering is poorly understood. The relatively rapid spatial and temporal migration rates within the clusters imply aseismic creep as a possible driver rather than fluid migration.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016GL072026DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016GL072026/abstractPublisherArticle
ORCID:
AuthorORCID
Hauksson, Egill0000-0002-6834-5051
Meier, Men-Andrin0000-0002-2949-8602
Ross, Zachary E.0000-0002-6343-8400
Additional Information:© 2017 American Geophysical Union. Received 27 NOV 2016; Accepted 20 JAN 2017; Accepted article online 24 JAN 2017; Published online 9 FEB 2017. Supported by USGS/NEHRP: G16AP00147, National Science Foundation (NSF): EAR-1550704, and Southern California Earthquake Center (contribution 7176) and funded by NSF EAR-1033462 and USGS G12AC20038. Figures done with PMG from Wessel et al. [2013]. Used data are from the Caltech/USGS SCSN; doi:10.7914/SN/CI; stored at Southern California Earthquake Data Center (SCEDC) doi:10.7909/C3WD3xH1.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGSG16AP00147
NSFEAR-1550704
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-1033462
USGSG12AC20038
Subject Keywords:seismicity; San Andreas fault; Coulomb stress; seismotectonics; earthqauke interaction; earthquake risk
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center7176
Record Number:CaltechAUTHORS:20170124-110939458
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170124-110939458
Official Citation:Hauksson, E., M.-A. Meier, Z. E. Ross, and L. M. Jones (2017), Evolution of seismicity near the southernmost terminus of the San Andreas Fault: Implications of recent earthquake clusters for earthquake risk in southern California, Geophys. Res. Lett., 44, 1293–1301, doi:10.1002/2016GL072026
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73666
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jan 2017 00:40
Last Modified:31 Aug 2017 22:15

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