Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published June 2016 | Supplemental Material + Published
Journal Article Open

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

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.

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.

Attached Files

Published - Ross_et_al-2016-Journal_of_Geophysical_Research__Solid_Earth.pdf

Supplemental Material - downloadSupplement_doi=10.1002_2F2016JB013003_file=jgrb51643-sup-0001-SI.pdf

Supplemental Material - downloadSupplement_doi=10.1002_2F2016JB013003_file=jgrb51643-sup-0001-ts01.docx

Files

Ross_et_al-2016-Journal_of_Geophysical_Research__Solid_Earth.pdf
Files (2.7 MB)

Additional details

Created:
August 22, 2023
Modified:
October 20, 2023