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Toward reliable automated estimates of earthquake source properties from body wave spectra

Ross, Zachary E. and Ben-Zion, Yehuda (2016) Toward reliable automated estimates of earthquake source properties from body wave spectra. Journal of Geophysical Research. Solid Earth, 121 (6). pp. 4390-4407. ISSN 2169-9313. https://resolver.caltech.edu/CaltechAUTHORS:20190423-155306174

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Abstract

We develop a two‐stage methodology for automated estimation of earthquake source properties from body wave spectra. An automated picking algorithm is used to window and calculate spectra for both P and S phases. Empirical Green's functions are stacked to minimize nongeneric source effects such as directivity and are used to deconvolve the spectra of target earthquakes for analysis. In the first stage, window lengths and frequency ranges are defined automatically from the event magnitude and used to get preliminary estimates of the P and S corner frequencies of the target event. In the second stage, the preliminary corner frequencies are used to update various parameters to increase the amount of data and overall quality of the deconvolved spectral ratios (target event over stacked Empirical Green's function). The obtained spectral ratios are used to estimate the corner frequencies, strain/stress drops, radiated seismic energy, apparent stress, and the extent of directivity for both P and S waves. The technique is applied to data generated by five small to moderate earthquakes in southern California at hundreds of stations. Four of the five earthquakes are found to have significant directivity. The developed automated procedure is suitable for systematic processing of large seismic waveform data sets with no user involvement.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/2016jb013003DOIArticle
ORCID:
AuthorORCID
Ross, Zachary E.0000-0002-6343-8400
Ben-Zion, Yehuda0000-0002-9602-2014
Additional Information:© 2016. American Geophysical Union. Received 18 MAR 2016. Accepted 20 MAY 2016. Accepted article online 26 MAY 2016. Published online 11 JUN 2016. The seismic data used in this study were obtained from the Southern California Earthquake Data Center [SCEDC, 2013]. This study was supported by the Earthquake Hazards Program of the USGS (grant G15AP00084) and the Southern California Earthquake Center (based on National Science Foundation (NSF) cooperative agreement EAR‐1033462 and USGS Cooperative agreement G12AC20038). We thank Associate Editor Germán Prieto and two anonymous reviewers for constructive comments that helped to improve the paper.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGSG15AP00084
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-1033462
USGSG12AC20038
Subject Keywords:earthquake source properties; automated analysis; stacked Green's function; rupture directivity; stress drops; radiated seismic energy
Issue or Number:6
Record Number:CaltechAUTHORS:20190423-155306174
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190423-155306174
Official Citation:Ross, Z. E., and Ben‐Zion, Y. ( 2016), Toward reliable automated estimates of earthquake source properties from body wave spectra, J. Geophys. Res. Solid Earth, 121, 4390– 4407, doi:10.1002/2016JB013003.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94898
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Apr 2019 14:43
Last Modified:03 Oct 2019 21:08

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