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Observations of remotely triggered seismicity in Salton Sea and Coso geothermal regions, Southern California, USA, after big (M_W>7.8) teleseismic earthquakes

Castro, Raúl R. and Clayton, Robert and Hauksson, Egill and Stock, Joann (2017) Observations of remotely triggered seismicity in Salton Sea and Coso geothermal regions, Southern California, USA, after big (M_W>7.8) teleseismic earthquakes. Geofisica Internacional, 56 (3). pp. 269-286. ISSN 0016-7169.

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A relocated catalog was used to search for changes in seismicity rate in the Salton Sea and the Coso geothermal regions, southern California, USA, during and after large (M_W>7.8) teleseismic earthquakes. Seismicity in these two regions was analyzed within 30- day windows before and after the occurrence of five major earthquakes: the 2002 Denali fault, Alaska (M_W 7.9); the 2004 Sumatra-Andaman (M_W 9.2); the 2010 Central Chile (M_W 8.8); the 2011 Tohoku-Oki, Japan (M_W 9.1); and the 2012 Offshore Northern Sumatra (M_W 8.6) earthquakes. The Denali (M_W 7.9) earthquake coincided with an increase in seismicity in the Salton Sea region the day when this remote event occurred, indicating that instantaneous triggered seismicity was likely related with the passage of its surface waves. However, in the Coso region the seismicity rate remained approximately constant during the 30-day observation period. The seismicity after the 2004 Sumatra-Andaman (M_W 9.2) earthquake increased in both regions 9 days after the mega-earthquake. The seismicity after the 2010 Chile (M_W 8.8) earthquake increased in both regions approximately 14 days after the remote event. The seismicity in Salton Sea and Coso regions increased 17 and 14 days, respectively, after the 2011 Japan (M_W 9.1) earthquake, suggesting that delayed triggered seismicity was induced after the passage of the surface waves in both regions. Similarly, 6 and 16 days after the 2012 northern Sumatra (M_W 8.6) earthquake the seismicity also increased in Salton Sea and Coso regions, respectively. These observations can be interpreted as evidence of instantaneous and delayed dynamic triggering induced by large remote earthquakes. The maximum magnitude of the delayed triggered swarm increased with the strength (M_0/D) of the mega-earthquake and, the stronger the remote earthquake, the longer the delay time.

Item Type:Article
Related URLs:
URLURL TypeDescription
Clayton, Robert0000-0003-3323-3508
Hauksson, Egill0000-0002-6834-5051
Stock, Joann0000-0003-4816-7865
Additional Information:© 2017 Instituto de Geofísica is licensed under a Creative Commons Reconocimiento-NoComercial-SinObraDerivada 3.0 Unported License. Received: September 27, 2016; accepted: January 08, 2017; published on line: July 01, 2017. This paper was prepared while the first author (RRC) was on sabbatical year in Caltech. We thank CONACYT and Prof. Gurnis for the support provided. Antonio Mendoza helped us to prepare some maps. We used parametric data from the Caltech/USGS Southern California Seismic Network (SCSN); DOI: 10.7914/SN/CI; stored at the Southern California Earthquake Center. doi:10.7909/C3WD3xH1. We thank the two anonymous reviewers and the Editor Dr. Xyoli Pérez-Campos for their comments and suggestions.
Group:Seismological Laboratory
Funding AgencyGrant Number
Consejo Nacional de Ciencia y Tecnología (CONACYT)UNSPECIFIED
Subject Keywords:remote triggering, seismicity southern California, USA, Coso geothermal field, Salton Sea geothermal field
Issue or Number:3
Record Number:CaltechAUTHORS:20170720-074723751
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79231
Deposited By: Tony Diaz
Deposited On:20 Jul 2017 18:33
Last Modified:03 Oct 2019 18:17

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