Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China

Schaff, David P.; Richards, Paul G.; Slinkard, Megan; Heck, Stephen; Young, Christopher

doi:10.1785/0120170137

Title: Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China

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Abstract

In this paper, we perform epicentral relocations for a broad area using cross-correlation measurements made on Lg waves recorded at regional distances on a sparse station network. Using a two-step procedure (pairwise locations and cluster locations), we obtain final locations for 5623 events—3689 for all of China from 1985 to 2005 and 1934 for the Wenchuan area from May to August 2008. These high-quality locations comprise 20% of a starting catalog for all of China and 25% of a catalog for Wenchuan. Of the 1934 events located for Wenchuan, 1662 (86%) were newly detected. The final locations explain the residuals 89 times better than the catalog locations for all of China (3.7302–0.0417 s) and 32 times better than the catalog locations for Wenchuan (0.8413–0.0267 s). The average semimajor axes of the 95% confidence ellipses are 420 m for all of China and 370 m for Wenchuan. The average azimuthal gaps are 205° for all of China and 266° for Wenchuan. 98% of the station distances for all of China are over 200 km. The mean and maximum station distances are 898 and 2174 km. The robustness of our location estimates and various trade-offs and sensitivities is explored with different inversionmore »« less

Authors:

Schaff, David P. ^[1]; Richards, Paul G. ^[1]; Slinkard, Megan ^[2]; Heck, Stephen ^[2]; Young, Christopher ^[2]

Columbia Univ., Palisades, NY (United States). Lamont-Doherty Earth Observatory
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Publication Date:: Tue Mar 20 00:00:00 EDT 2018

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Columbia Univ., Palisades, NY (United States)

Sponsoring Org.:: USDOE; Defense Threat Reduction Agency (DTRA) (United States)

OSTI Identifier:: 1429752

Report Number(s):: SAND-2017-3000J
Journal ID: ISSN 0037-1106; 651893

Grant/Contract Number:: AC04-94AL85000; HDTRA1-11-1-0027

Resource Type:: Accepted Manuscript

Journal Name:: Bulletin of the Seismological Society of America

Additional Journal Information:: Journal Volume: 108; Journal Issue: 3A; Journal ID: ISSN 0037-1106

Publisher:: Seismological Society of America

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES

Citation Formats


                    Schaff, David P., Richards, Paul G., Slinkard, Megan, Heck, Stephen, and Young, Christopher. Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China.  United States: N. p., 2018. 
Web.  doi:10.1785/0120170137.

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                    Schaff, David P., Richards, Paul G., Slinkard, Megan, Heck, Stephen, & Young, Christopher. Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China.  United States.  https://doi.org/10.1785/0120170137

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                    Schaff, David P., Richards, Paul G., Slinkard, Megan, Heck, Stephen, and Young, Christopher. Tue .  
"Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China".  United States.  https://doi.org/10.1785/0120170137.  https://www.osti.gov/servlets/purl/1429752.

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@article{osti_1429752,

  title        = {Lg-Wave Cross Correlation and Epicentral Double-Difference Location in and near China},

  author       = {Schaff, David P. and Richards, Paul G. and Slinkard, Megan and Heck, Stephen and Young, Christopher},

  abstractNote = {In this paper, we perform epicentral relocations for a broad area using cross-correlation measurements made on Lg waves recorded at regional distances on a sparse station network. Using a two-step procedure (pairwise locations and cluster locations), we obtain final locations for 5623 events—3689 for all of China from 1985 to 2005 and 1934 for the Wenchuan area from May to August 2008. These high-quality locations comprise 20% of a starting catalog for all of China and 25% of a catalog for Wenchuan. Of the 1934 events located for Wenchuan, 1662 (86%) were newly detected. The final locations explain the residuals 89 times better than the catalog locations for all of China (3.7302–0.0417 s) and 32 times better than the catalog locations for Wenchuan (0.8413–0.0267 s). The average semimajor axes of the 95% confidence ellipses are 420 m for all of China and 370 m for Wenchuan. The average azimuthal gaps are 205° for all of China and 266° for Wenchuan. 98% of the station distances for all of China are over 200 km. The mean and maximum station distances are 898 and 2174 km. The robustness of our location estimates and various trade-offs and sensitivities is explored with different inversion parameters for the location, such as starting locations for iterative solutions and which singular values to include. Finally, our results provide order-of-magnitude improvements in locations for event clusters, using waveforms from a very sparse far-regional network for which data are openly available.},

  doi          = {10.1785/0120170137},

  journal      = {Bulletin of the Seismological Society of America},

  number       = 3A,

  volume       = 108,

  place        = {United States},

  year         = {Tue Mar 20 00:00:00 EDT 2018},

  month        = {Tue Mar 20 00:00:00 EDT 2018}

}

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