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An earthquake detection algorithm with pseudo-probabilities of multiple indicators

Ross, Z. E. and Ben-Zion, Y. (2014) An earthquake detection algorithm with pseudo-probabilities of multiple indicators. Geophysical Journal International, 197 (1). pp. 458-463. ISSN 0956-540X. doi:10.1093/gji/ggt516.

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We develop an automatic earthquake detection algorithm combining information from numerous indicator variables in a non-parametric framework. The method is shown to perform well with multiple ratios of moving short- and long-time averages having ranges of time intervals and frequency bands. The results from each indicator are transformed to a pseudo-probability time-series (PPTS) in the range [0, 1]. The various PPTS of the different indicators are multiplied to form a single joint PPTS that is used for detections. Since all information is combined, redundancy among the different indicators produces robust peaks in the output. This allows the trigger threshold applied to the joint PPTS to be significantly lower than for any one detector, leading to substantially more detected earthquakes. Application of the algorithm to a small data set recorded during a 7-d window by 13 stations near the San Jacinto fault zone detects 3.13 times as many earthquakes as listed in the Southern California Seismic Network catalogue. The method provides a convenient statistical platform for including other indicators, and may utilize different sets of indicators to detect other information such as specific seismic phases or tremor.

Item Type:Article
Related URLs:
URLURL TypeDescription
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 2013 December 19. Received 2013 December 18; in original form 2013 November 15. The study was supported by the National Science Foundation (grant EAR-0908903). The manuscript benefitted from constructive comments of two anonymous referees.
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Time-series analysis, Probability distributions, Earthquake dynamics, Earthquake source observations, Dynamics and mechanics of faulting
Issue or Number:1
Record Number:CaltechAUTHORS:20190423-155307190
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Official Citation:Z.E. Ross, Y. Ben-Zion, An earthquake detection algorithm with pseudo-probabilities of multiple indicators, Geophysical Journal International, Volume 197, Issue 1, April, 2014, Pages 458–463,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94905
Deposited By: George Porter
Deposited On:24 Apr 2019 14:24
Last Modified:16 Nov 2021 17:08

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