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Title: Searching for hidden earthquakes in Southern California

Abstract

Earthquakes follow a well-known power-law size relation, with smaller events occurring much more often than larger events. Earthquake catalogs are thus dominated by small earthquakes, yet still missing a much larger number of even smaller events caused by signal fidelity issues. To overcome these limitations, we applied a template matching detection technique to the entire waveform archive of the regional seismic network in southern California. Furthermore this effort resulted in a catalog with 1.81 million earthquakes, a factor of 10 increase, which provides important new insights into the geometry of fault zones at depth, foreshock behavior and nucleation processes, and earthquake triggering mechanisms. The extraordinary detail resolved in this type of catalog will facilitate a new generation of analyses of earthquakes and faults.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1511259
Report Number(s):
LA-UR-19-20273
Journal ID: ISSN 0036-8075
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Name: Science; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences

Citation Formats

Ross, Zachary E., Trugman, Daniel T., Hauksson, Egill, and Shearer, Peter M.. Searching for hidden earthquakes in Southern California. United States: N. p., 2019. Web. doi:10.1126/science.aaw6888.
Ross, Zachary E., Trugman, Daniel T., Hauksson, Egill, & Shearer, Peter M.. Searching for hidden earthquakes in Southern California. United States. doi:10.1126/science.aaw6888.
Ross, Zachary E., Trugman, Daniel T., Hauksson, Egill, and Shearer, Peter M.. Thu . "Searching for hidden earthquakes in Southern California". United States. doi:10.1126/science.aaw6888.
@article{osti_1511259,
title = {Searching for hidden earthquakes in Southern California},
author = {Ross, Zachary E. and Trugman, Daniel T. and Hauksson, Egill and Shearer, Peter M.},
abstractNote = {Earthquakes follow a well-known power-law size relation, with smaller events occurring much more often than larger events. Earthquake catalogs are thus dominated by small earthquakes, yet still missing a much larger number of even smaller events caused by signal fidelity issues. To overcome these limitations, we applied a template matching detection technique to the entire waveform archive of the regional seismic network in southern California. Furthermore this effort resulted in a catalog with 1.81 million earthquakes, a factor of 10 increase, which provides important new insights into the geometry of fault zones at depth, foreshock behavior and nucleation processes, and earthquake triggering mechanisms. The extraordinary detail resolved in this type of catalog will facilitate a new generation of analyses of earthquakes and faults.},
doi = {10.1126/science.aaw6888},
journal = {Science},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 18, 2020
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