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Lack of additional triggered tectonic tremor around the Simi Valley and the San Gabriel Mountain in Southern California

Hongfeng Yang and Zhigang Peng
Lack of additional triggered tectonic tremor around the Simi Valley and the San Gabriel Mountain in Southern California
Bulletin of the Seismological Society of America (December 2013) 103 (6): 3372-3378

Abstract

We conduct a systematic search of tectonic tremor triggered by distant large earthquakes around the Simi Valley (SV) and the San Gabriel Mountain (SGM) in southern California. Out of 59 large earthquakes between 2000 and 2013, only the 2002 M (sub w) 7.9 Denali fault earthquake triggered clear tremor in the region. The observed travel times of the triggered tremors are consistent with theoretical predictions from tremor sources that are spatially clustered in the SV, close to the rupture zone of the 1994 M (sub w) 6.7 Northridge earthquake. We also estimate the triggering stress threshold as approximately 12 kPa from measuring the peak ground velocities near the tremor source. The lack of clear tremor beneath the SGM provides a "negative" example for a region where tremor is expected to occur because of clear evidence of fluid-rich zones at the middle crust. The results imply that the necessary conditions for tremor to occur are more than fluid-induced low effective normal stress. Online Material: Figures of additional tremor inspection, tables of earthquake catalogs, and tremor locations.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 103
Serial Issue: 6
Title: Lack of additional triggered tectonic tremor around the Simi Valley and the San Gabriel Mountain in Southern California
Affiliation: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States
Pages: 3372-3378
Published: 201312
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 38
Accession Number: 2014-001491
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N34°02'60" - N34°52'60", W119°27'00" - W118°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201402
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