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Automatic picking of direct P, S seismic phases and fault zone head waves

Ross, Z. E. and Ben-Zion, Y. (2014) Automatic picking of direct P, S seismic phases and fault zone head waves. Geophysical Journal International, 199 (1). pp. 368-381. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:20190423-155307099

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Abstract

We develop a set of algorithms for automatic detection and picking of direct P and S waves, as well as fault zone head waves (FZHW), generated by earthquakes on faults that separate different lithologies and recorded by local seismic networks. The S-wave picks are performed using polarization analysis and related filters to remove P-wave energy from the seismograms, and utilize STA/LTA and kurtosis detectors in tandem to lock on the phase arrival. The early portions of P waveforms are processed with STA/LTA, kurtosis and skewness detectors for possible first-arriving FZHW. Identification and picking of direct P and FZHW is performed by a multistage algorithm that accounts for basic characteristics (motion polarities, time difference, sharpness and amplitudes) of the two phases. The algorithm is shown to perform well on synthetic seismograms produced by a model with a velocity contrast across the fault, and observed data generated by earthquakes along the Parkfield section of the San Andreas fault and the Hayward fault. The developed techniques can be used for systematic processing of large seismic waveform data sets recorded near major faults.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/gji/ggu267DOIArticle
ORCID:
AuthorORCID
Ross, Z. E.0000-0002-6343-8400
Ben-Zion, Y.0000-0002-9602-2014
Additional Information:© The Authors 2014. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2014 July 8. Received 2014 July 5; in original form 2014 March 24. The study was supported by the National Science Foundation (grants EAR-0908903 and EAR-1315340). The manuscript benefitted from constructive comments of two anonymous referees.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-0908903
NSFEAR-1315340
Subject Keywords:Time-series analysis, Earthquake source observations, Body waves, Interface waves, Wave propagation
Issue or Number:1
Record Number:CaltechAUTHORS:20190423-155307099
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190423-155307099
Official Citation:Z. E. Ross, Y. Ben-Zion, Automatic picking of direct P, S seismic phases and fault zone head waves, Geophysical Journal International, Volume 199, Issue 1, October, 2014, Pages 368–381, https://doi.org/10.1093/gji/ggu267
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94904
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Apr 2019 23:21
Last Modified:03 Oct 2019 21:08

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