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Published August 2018 | public
Journal Article

Rapid Earthquake Discrimination for Earthquake Early Warning: A Bayesian Probabilistic Approach Using Three-Component Single‐Station Waveforms and Seismicity Forecast

Abstract

The utility of Earthquake Early Warning (EEW) relies on the robust and rapid classification of near‐site earthquake source signals from noise and teleseismic arrivals. To achieve this goal, we propose using the three‐component acceleration and velocity waveform data and epidemic‐type aftershock sequence (ETAS) seismicity forecast information in parallel, which will produce a posterior prediction by combining the predictions from the heterogeneous sources using a Bayesian probabilistic approach. We collected 2481 three‐component strong‐motion records for training and testing. The rapid prediction is available as quickly as 0.5 s after the trigger at a single station and updates every 0.5 s up to 3.0 s, achieving a precision rate of 94.7% at the first prediction with the classification accuracy increasing with time. The leave‐one‐out cross‐validation method also demonstrates confidence of robust performance for future earthquake signal detections. We compared the method with the τ_c−P_d EEW classification criterion and find that our prediction is 83% faster. Because the method evaluates two independent sources of information simultaneously under an ensemble model, the new strategy has shown fast predictions with promising results and the implementation of this methodology could provide significantly faster and more reliable EEW warnings to regions near the earthquake's epicenter, where the strongest shaking is observed.

Additional Information

© 2018 Seismological Society of America. Manuscript received 3 May 2017; Published Online 12 June 2018. Data and Resources: The strong‐motion records used in this study are downloaded from the Southern California Earthquake Data Center (http://scedc.caltech.edu, last accessed June 2016). The catalog database is downloaded from Advanced National Seismic System (ANSS) Composite Catalog (http://www.ncedc.org/anss/, last accessed June 2016). This research was supported by the Gordon and Betty Moore Foundation Grant Numbers 3023 and 5229, and U.S. Geological Survey/National Earthquake Hazards Reduction Program (USGS/NEHRP) Cooperative Agreement G16AC00355. This research was also supported by the Natural Sciences and Engineering Research Council of Canada's (NSERC) Postgraduate Scholarships‐Doctoral Program.

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023