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Title: Pushing the limit of earthquake detection with distributed acoustic sensing and template matching: a case study at the Brady geothermal field

Abstract

Template matching has been widely applied in the detection of earthquakes and other seismic events due to its power in detecting weak signals. Recent studies using synthetics have shown that application of template matching to large-N arrays can potentially detect earthquakes substantially below the noise level. Here we apply template matching to the distributed acoustic sensing (DAS) data recorded in the Brady Hot Springs geothermal field, Nevada. Using 5 catalogued events, we detect 116 events and find 68 of them well below the noise level. We confirm 112 events are true earthquakes by examining the patterns of their sensor-to-sensor cross-correlation sections. This demonstrates that the combination of DAS and template matching has capability to detect microseismicity below the noise level, which is unusual for conventional seismic arrays and methods. With the updated catalogue, we observe a surge of earthquakes during the shutdown of a geothermal power plant nearby. In addition, the rapid increases in the downhole pressure record coincide with intense swarms of earthquakes. These observations show a strong correlation between the seismicity frequencies and the downhole pressure changes. Finally, we investigate several factors that may affect the detection performance and compare different strategies for spatial down-sampling, in order tomore » provide helpful insights for future large-N design and data processing.« less

Authors:
ORCiD logo [1];  [1]
  1. Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)
OSTI Identifier:
1469719
Alternate Identifier(s):
OSTI ID: 1613386
Grant/Contract Number:  
EE0006760; 1722879
Resource Type:
Published Article
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Name: Geophysical Journal International Journal Volume: 215 Journal Issue: 3; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English
Subject:
58 GEOSCIENCES; geochemistry & geophysics; earthquake source observations; induced seismicity; seismic instruments

Citation Formats

Li, Zefeng, and Zhan, Zhongwen. Pushing the limit of earthquake detection with distributed acoustic sensing and template matching: a case study at the Brady geothermal field. United Kingdom: N. p., 2018. Web. doi:10.1093/gji/ggy359.
Li, Zefeng, & Zhan, Zhongwen. Pushing the limit of earthquake detection with distributed acoustic sensing and template matching: a case study at the Brady geothermal field. United Kingdom. doi:10.1093/gji/ggy359.
Li, Zefeng, and Zhan, Zhongwen. Mon . "Pushing the limit of earthquake detection with distributed acoustic sensing and template matching: a case study at the Brady geothermal field". United Kingdom. doi:10.1093/gji/ggy359.
@article{osti_1469719,
title = {Pushing the limit of earthquake detection with distributed acoustic sensing and template matching: a case study at the Brady geothermal field},
author = {Li, Zefeng and Zhan, Zhongwen},
abstractNote = {Template matching has been widely applied in the detection of earthquakes and other seismic events due to its power in detecting weak signals. Recent studies using synthetics have shown that application of template matching to large-N arrays can potentially detect earthquakes substantially below the noise level. Here we apply template matching to the distributed acoustic sensing (DAS) data recorded in the Brady Hot Springs geothermal field, Nevada. Using 5 catalogued events, we detect 116 events and find 68 of them well below the noise level. We confirm 112 events are true earthquakes by examining the patterns of their sensor-to-sensor cross-correlation sections. This demonstrates that the combination of DAS and template matching has capability to detect microseismicity below the noise level, which is unusual for conventional seismic arrays and methods. With the updated catalogue, we observe a surge of earthquakes during the shutdown of a geothermal power plant nearby. In addition, the rapid increases in the downhole pressure record coincide with intense swarms of earthquakes. These observations show a strong correlation between the seismicity frequencies and the downhole pressure changes. Finally, we investigate several factors that may affect the detection performance and compare different strategies for spatial down-sampling, in order to provide helpful insights for future large-N design and data processing.},
doi = {10.1093/gji/ggy359},
journal = {Geophysical Journal International},
number = 3,
volume = 215,
place = {United Kingdom},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1093/gji/ggy359

Citation Metrics:
Cited by: 5 works
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    Works referencing / citing this record:

    The Potential of DAS in Teleseismic Studies: Insights From the Goldstone Experiment
    journal, February 2019

    • Yu, Chunquan; Zhan, Zhongwen; Lindsey, Nathaniel J.
    • Geophysical Research Letters, Vol. 46, Issue 3
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    Distributed sensing of microseisms and teleseisms with submarine dark fibers
    journal, December 2019

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    • Nature Communications, Vol. 10, Issue 1
    • DOI: 10.1038/s41467-019-13262-7

    Distributed Acoustic Sensing Using Dark Fiber for Near-Surface Characterization and Broadband Seismic Event Detection
    journal, February 2019