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Title: Detection of small earthquakes with dense array data: example from the San Jacinto fault zone, southern California

Abstract

We present a technique to detect small earthquakes not included in standard catalogues using data from a dense seismic array. The technique is illustrated with continuous waveforms recorded in a test day by 1108 vertical geophones in a tight array on the San Jacinto fault zone. Waveforms are first stacked without time-shift in nine non-overlapping subarrays to increase the signal-to-noise ratio. The nine envelope functions of the stacked records are then multiplied with each other to suppress signals associated with sources affecting only some of the nine subarrays. Running a short-term moving average/long-term moving average (STA/LTA) detection algorithm on the product leads to 723 triggers in the test day. Using a local P-wave velocity model derived for the surface layer from Betsy gunshot data, 5 s long waveforms of all sensors around each STA/LTA trigger are beamformed for various incident directions. Of the 723 triggers, 220 are found to have localized energy sources and 103 of these are confirmed as earthquakes by verifying their observation at 4 or more stations of the regional seismic network. This demonstrates the general validity of the method and allows processing further the validated events using standard techniques. The number of validated events in themore » test day is >5 times larger than that in the standard catalogue. Using these events as templates can lead to additional detections of many more earthquakes.« less

Authors:
 [1];  [1]
  1. Univ. of Southern California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540597
Grant/Contract Number:  
SC0016520
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Volume: 212; Journal Issue: 1; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geochemistry & Geophysics

Citation Formats

Meng, Haoran, and Ben-Zion, Yehuda. Detection of small earthquakes with dense array data: example from the San Jacinto fault zone, southern California. United States: N. p., 2017. Web. doi:10.1093/gji/ggx404.
Meng, Haoran, & Ben-Zion, Yehuda. Detection of small earthquakes with dense array data: example from the San Jacinto fault zone, southern California. United States. doi:10.1093/gji/ggx404.
Meng, Haoran, and Ben-Zion, Yehuda. Mon . "Detection of small earthquakes with dense array data: example from the San Jacinto fault zone, southern California". United States. doi:10.1093/gji/ggx404. https://www.osti.gov/servlets/purl/1540597.
@article{osti_1540597,
title = {Detection of small earthquakes with dense array data: example from the San Jacinto fault zone, southern California},
author = {Meng, Haoran and Ben-Zion, Yehuda},
abstractNote = {We present a technique to detect small earthquakes not included in standard catalogues using data from a dense seismic array. The technique is illustrated with continuous waveforms recorded in a test day by 1108 vertical geophones in a tight array on the San Jacinto fault zone. Waveforms are first stacked without time-shift in nine non-overlapping subarrays to increase the signal-to-noise ratio. The nine envelope functions of the stacked records are then multiplied with each other to suppress signals associated with sources affecting only some of the nine subarrays. Running a short-term moving average/long-term moving average (STA/LTA) detection algorithm on the product leads to 723 triggers in the test day. Using a local P-wave velocity model derived for the surface layer from Betsy gunshot data, 5 s long waveforms of all sensors around each STA/LTA trigger are beamformed for various incident directions. Of the 723 triggers, 220 are found to have localized energy sources and 103 of these are confirmed as earthquakes by verifying their observation at 4 or more stations of the regional seismic network. This demonstrates the general validity of the method and allows processing further the validated events using standard techniques. The number of validated events in the test day is >5 times larger than that in the standard catalogue. Using these events as templates can lead to additional detections of many more earthquakes.},
doi = {10.1093/gji/ggx404},
journal = {Geophysical Journal International},
number = 1,
volume = 212,
place = {United States},
year = {2017},
month = {9}
}

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