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Title: Detection of the Wenchuan aftershock sequence using waveform correlation with a composite regional network

Abstract

Using template waveforms from aftershocks of the Wenchuan earthquake (12 May 2008, M s 8.0) listed in a global bulletin and continuous data from eight regional stations, we detected more than 6000 additional events in the mainshock source region from 1 May to 12 August 2008. These new detections obey Omori’s law, extend the magnitude of completeness downward by 1.1 magnitude units, and lead to a more than fivefold increase in number of known aftershocks compared with the global bulletins published by the International Data Centre and the Inter national Seismological Centre. Moreover, we detected more M > 2 events than were listed by the Sichuan Seismograph Network. Several clusters of these detections were then relocated using the double-difference method, yielding locations that reduced travel-time residuals by a factor of 32 compared with the initial bulletin locations. Finally, our results suggest that using waveform correlation on a few regional stations can find aftershock events very effectively and locate them with precision.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Lamont-Doherty Earth Observatory, Palisades, NY (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1341398
Report Number(s):
SAND-2016-12359J
Journal ID: ISSN 0037-1106; 649730
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Bulletin of the Seismological Society of America
Additional Journal Information:
Journal Volume: 106; Journal Issue: 4; Journal ID: ISSN 0037-1106
Publisher:
Seismological Society of America
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Slinkard, Megan, Heck, Stephen, Schaff, David, Bonal, Nedra, Daily, David, Young, Christopher, and Richards, Paul. Detection of the Wenchuan aftershock sequence using waveform correlation with a composite regional network. United States: N. p., 2016. Web. doi:10.1785/0120150333.
Slinkard, Megan, Heck, Stephen, Schaff, David, Bonal, Nedra, Daily, David, Young, Christopher, & Richards, Paul. Detection of the Wenchuan aftershock sequence using waveform correlation with a composite regional network. United States. doi:10.1785/0120150333.
Slinkard, Megan, Heck, Stephen, Schaff, David, Bonal, Nedra, Daily, David, Young, Christopher, and Richards, Paul. Tue . "Detection of the Wenchuan aftershock sequence using waveform correlation with a composite regional network". United States. doi:10.1785/0120150333. https://www.osti.gov/servlets/purl/1341398.
@article{osti_1341398,
title = {Detection of the Wenchuan aftershock sequence using waveform correlation with a composite regional network},
author = {Slinkard, Megan and Heck, Stephen and Schaff, David and Bonal, Nedra and Daily, David and Young, Christopher and Richards, Paul},
abstractNote = {Using template waveforms from aftershocks of the Wenchuan earthquake (12 May 2008, Ms 8.0) listed in a global bulletin and continuous data from eight regional stations, we detected more than 6000 additional events in the mainshock source region from 1 May to 12 August 2008. These new detections obey Omori’s law, extend the magnitude of completeness downward by 1.1 magnitude units, and lead to a more than fivefold increase in number of known aftershocks compared with the global bulletins published by the International Data Centre and the Inter national Seismological Centre. Moreover, we detected more M > 2 events than were listed by the Sichuan Seismograph Network. Several clusters of these detections were then relocated using the double-difference method, yielding locations that reduced travel-time residuals by a factor of 32 compared with the initial bulletin locations. Finally, our results suggest that using waveform correlation on a few regional stations can find aftershock events very effectively and locate them with precision.},
doi = {10.1785/0120150333},
journal = {Bulletin of the Seismological Society of America},
number = 4,
volume = 106,
place = {United States},
year = {Tue Jun 28 00:00:00 EDT 2016},
month = {Tue Jun 28 00:00:00 EDT 2016}
}

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