Enhancing Offshore Earthquake Early Warning with a Submarine DAS Array in Monterey Bay, California
Detecting offshore earthquakes in real-time is challenging for traditional land-based seismic networks due to insufficient station coverage. Application of DAS to submarine cables has the potential to extend the reach of seismic networks and thereby improve real-time earthquake detection and Earthquake Early Warning (EEW). We present results testing modified point-source EEW algorithms (EPIC) with data from SeaFOAM DAS deployment (52 km-long submarine cable) in Monterey Bay, CA. The region is seismically active with the nearby San Andreas Fault system, and the offshore San Gregorio Fault system (SGFs) which the cable crosses.
Around 1.5 year’s data has been collected by the permanent SeaFOAM project, including more than 10 offshore events on the SGFs. We developed a workflow that can be migrated to other DAS cables to detect earthquakes in real-time. We took a transfer learning approach with recorded local earthquakes to get a locally optimized PhaseNet-DAS machine learning model for P and S arrivals picking. We used a grid search method with available picks from the whole DAS array and a local 1D velocity model to locate the earthquakes. A calibrated empirical strain rate-to-magnitude equation is used to perform a real-time estimation of the magnitude. We extended our analysis to more recorded earthquakes and demonstrated the independent earthquake detection ability of an offshore DAS array. In the future, this DAS-specific EEW algorithm will be integrated into the existing EPIC algorithm for testing. This approach has the potential to extend earthquake detection for EEW offshore, thereby increasing warning times significantly.
Session: End-to-End Advancements in Earthquake Early Warning Systems -IV
Type: Oral
Room: Tikahtnu Ballroom E/F
Date: 5/3/2024
Presentation Time: 11:30 AM (local time)
Presenting Author: Yuancong Gou
Student Presenter: Yes
Additional Authors
Yuancong Gou Presenting Author Corresponding Author yuancong_gou@berkeley.edu University of California, Berkeley |
Richard Allen rallen@berkeley.edu University of California, Berkeley |
Weiqiang Zhu zhuwq@berkeley.edu University of California, Berkeley |
Li-Wei Chen liwei_chen@berkeley.edu University of California, Berkeley |
Taka'aki Taira taira@berkeley.edu University of California, Berkeley |
Ivan Henson ihenson@berkeley.edu University of California, Berkeley |
Julien Marty jmarty@berkeley.edu University of California, Berkeley |
Knute Brekke knute@mbari.org Monterey Bay Aquarium Research Institute |
Douglas Neuhauser dougneuhauser@berkeley.edu University of California, Berkeley |
Brian Pardini bpardini@berkeley.edu University of California, Berkeley, Berkeley, California, United States |
Stephen Thompson stephen.thompson@berkeley.edu University of California, Berkeley, Berkeley, California, United States |
Victor Yartsev Victor.Yartsev@optasense.com OptaSense, Chino, California, United States |
Junli Zhang junlizhang@berkeley.edu University of California, Berkeley, Berkeley, California, United States |
Stephane Zuzlewski stephane@berkeley.edu University of California, Berkeley, Berkeley, California, United States |
Barbara Romanowicz barbarar@berkeley.edu University of California, Berkeley, Berkeley, California, United States |
Enhancing Offshore Earthquake Early Warning with a Submarine DAS Array in Monterey Bay, California
Category
End-to-End Advancements in Earthquake Early Warning Systems
Description