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Analysis of earthquake body wave spectra for potency and magnitude values: implications for magnitude scaling relations

Ross, Zachary E. and Ben-Zion, Yehuda and White, Malcolm C. and Vernon, Frank L. (2016) Analysis of earthquake body wave spectra for potency and magnitude values: implications for magnitude scaling relations. Geophysical Journal International, 207 (2). pp. 1158-1164. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:20161017-141543484

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Abstract

We develop a simple methodology for reliable automated estimation of the low-frequency asymptote in seismic body wave spectra of small to moderate local earthquakes. The procedure corrects individual P- and S-wave spectra for propagation and site effects and estimates the seismic potency from a stacked spectrum. The method is applied to >11 000 earthquakes with local magnitudes 0 < M_L < 4 that occurred in the Southern California plate-boundary region around the San Jacinto fault zone during 2013. Moment magnitude M_w values, derived from the spectra and the scaling relation of Hanks & Kanamori, follow a Gutenberg–Richter distribution with a larger b-value (1.22) from that associated with the M_L values (0.93) for the same earthquakes. The completeness magnitude for the M_w values is 1.6 while for M_L it is 1.0. The quantity (M_w – M_L) linearly increases in the analysed magnitude range as M_L decreases. An average earthquake with M_L = 0 in the study area has an M_w of about 0.9. The developed methodology and results have important implications for earthquake source studies and statistical seismology.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/gji/ggw327DOIArticle
http://gji.oxfordjournals.org/content/207/2/1158PublisherArticle
http://gji.oxfordjournals.org/content/207/2/1158/suppl/DC1PublisherSupporting Information
ORCID:
AuthorORCID
Ross, Zachary E.0000-0002-6343-8400
Ben-Zion, Yehuda0000-0002-9602-2014
Additional Information:© The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2016 August 31. Received 2016 August 22. In original form 2016 March 23. First published online: September 2, 2016. The study was supported by the Earthquake Hazards Programme of the United States Geological Survey (grant G15AP00084). The paper benefitted from reviews by Nicholas Deichmann, two anonymous reviewers, and editor Jörg Renner.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGSG15AP00084
Subject Keywords:Earthquake source observations; Seismicity and tectonics; Body waves; Statistical seismology
Issue or Number:2
Record Number:CaltechAUTHORS:20161017-141543484
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161017-141543484
Official Citation:Zachary E. Ross, Yehuda Ben-Zion, Malcolm C. White, and Frank L. Vernon Analysis of earthquake body wave spectra for potency and magnitude values: implications for magnitude scaling relations Geophys. J. Int. (November, 2016) 207 (2): 1158-1164 first published online September 2, 2016 doi:10.1093/gji/ggw327
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71184
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Oct 2016 21:28
Last Modified:03 Oct 2019 16:04

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