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A Method for Calibration of the Local Magnitude Scale Based on Relative Spectral Amplitudes, and Application to the San Juan Bautista, California, Area

Hawthorne, Jessica C. and Ampuero, Jean-Paul and Simons, Mark (2017) A Method for Calibration of the Local Magnitude Scale Based on Relative Spectral Amplitudes, and Application to the San Juan Bautista, California, Area. Bulletin of the Seismological Society of America, 107 (1). pp. 85-96. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20161220-103256360

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Abstract

We develop and use a spectral empirical Green’s function approach to estimate the relative source amplitudes of earthquakes near San Juan Bautista, California. We isolate the source amplitudes from path effects by comparing the recorded spectra of pairs of events with similar location and focal mechanism, without computing the path effect. With this method, we estimate the relative moments of 1600 M 1.5–4 local earthquakes, and we use these moments to recalibrate the duration magnitude scale in this region. The estimated moments of these small earthquakes increase with catalog magnitude M_D roughly proportionally to 10^(1.1M_D), slightly more slowly than a moment‐magnitude scaling of 10^(1.5M_w). This more accurate magnitude scaling can be used in analyses of the local earthquakes, such as comparisons between the seismic moments and geodetic observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1785/0120160141 DOIArticle
http://www.bssaonline.org/content/107/1/85PublisherArticle
http://bssa.geoscienceworld.org/content/107/1/85PublisherArticle
http://www.seismosoc.org/Publications/BSSA_html/bssa_107-1/2016141-esupp/index.htmlPublisherSupplement
ORCID:
AuthorORCID
Ampuero, Jean-Paul0000-0002-4827-7987
Simons, Mark0000-0003-1412-6395
Additional Information:© 2016 Seismological Society of America. First Published on December 20, 2016. We thank Grzegorz Kwiatek and two anonymous reviewers for useful comments on the article.
Group:Seismological Laboratory
Record Number:CaltechAUTHORS:20161220-103256360
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161220-103256360
Official Citation:Jessica C. Hawthorne, Jean‐Paul Ampuero, and Mark Simons A Method for Calibration of the Local Magnitude Scale Based on Relative Spectral Amplitudes, and Application to the San Juan Bautista, California, Area Bulletin of the Seismological Society of America February 2017 107:85-96; published ahead of print December 20, 2016, doi:10.1785/0120160141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72978
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Dec 2016 18:50
Last Modified:03 Feb 2017 16:56

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