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An Improved Algorithm for Real‐TimeS‐Wave Picking with Application to the (Augmented) ANZA Network in Southern California

Ross, Z. E. and White, M. C. and Vernon, F. L. and Ben-Zion, Y. (2016) An Improved Algorithm for Real‐TimeS‐Wave Picking with Application to the (Augmented) ANZA Network in Southern California. Bulletin of the Seismological Society of America, 106 (5). pp. 2013-2022. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20190423-155306054

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Abstract

We develop an automatic shear‐wave picking algorithm suitable for real‐time applications as well as with existing databases. The method can scan through packets of continuous waveforms and make picks without prior knowledge of whether earthquakes have occurred. This makes the algorithm suitable for detecting earthquakes at the same time. Expanding upon and improving the method of Ross and Ben‐Zion (2014a), the algorithm first uses polarization filters to remove P‐wave energy from the seismogram. Then, short‐term average/long‐term average and kurtosis detectors are applied to the data in tandem to lock in on the phase arrival. The method is tested by applying it to a full month of continuous waveform data recorded by a regional network at 123 stations and comparing the resulting automatic picks with 11,353 handmade picks. The automatic picks are found to be within 0.16 s of the analyst picks 75% of the time, and S picks are successful 92% of the time that a P‐wave pick is made. The algorithm is then applied to an entire year of continuous data and detects 11,197 earthquakes. The hypocenters of these earthquakes are, on average, improved by more than 1 km when compared with the regional network’s automated catalog.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1785/0120150230DOIArticle
ORCID:
AuthorORCID
Ross, Z. E.0000-0002-6343-8400
Ben-Zion, Y.0000-0002-9602-2014
Additional Information:© 2016 Seismological Society of America. Manuscript received 27 August 2015; Published Online 19 July 2016. This work was funded by the National Science Foundation Grant Numbers EAR‐0908903 and EAR‐0908042. We thank Associate Editor Eric Chael and an anonymous reviewer for their constructive comments.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-0908903
NSFEAR-0908042
Issue or Number:5
Record Number:CaltechAUTHORS:20190423-155306054
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190423-155306054
Official Citation:Z. E. Ross, M. C. White, F. L. Vernon, Y. Ben‐Zion; An Improved Algorithm for Real‐Time S‐Wave Picking with Application to the (Augmented) ANZA Network in Southern California. Bulletin of the Seismological Society of America ; 106 (5): 2013–2022. doi: https://doi.org/10.1785/0120150230
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94897
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Apr 2019 14:35
Last Modified:03 Oct 2019 21:08

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