Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

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

TitleAnalysis of earthquake body wave spectra for potency and magnitude values: implications for magnitude scaling relations
Publication TypeJournal Article
Year of Publication2016
AuthorsRoss Z.E, Ben-Zion Y., White M.C, Vernon FL
JournalGeophysical Journal International
Volume207
Pagination1158-1164
Date Published2016/11
Type of ArticleArticle
ISBN Number0956-540X
Accession NumberWOS:000386453200033
Keywordsattenuation; Body waves; coefficients; deep borehole recordings; depth; Earthquake source observations; fault; models; moment-magnitude; Seismicity and tectonics; seismograms; southern california; statistical seismology; stress
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.

DOI10.1093/gji/ggw327
Student Publication: 
No
sharknado