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:
-
[1];
[2];
[1];
[3]
- Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.
- Geophysics Group, Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1547997
- Alternate Identifier(s):
- OSTI ID: 1511259
- Report Number(s):
- LA-UR-19-20273
Journal ID: ISSN 0036-8075; /sci/364/6442/767.atom
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Published Article
- Journal Name:
- Science
- Additional Journal Information:
- Journal Name: Science Journal Volume: 364 Journal Issue: 6442; Journal ID: ISSN 0036-8075
- Publisher:
- American Association for the Advancement of Science (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. https://doi.org/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. https://doi.org/10.1126/science.aaw6888.
@article{osti_1547997,
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 = 6442,
volume = 364,
place = {United States},
year = {Thu Apr 18 00:00:00 EDT 2019},
month = {Thu Apr 18 00:00:00 EDT 2019}
}
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