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Catalog Update: A Detailed Earthquake Catalog for the San Jacinto Fault Zone Region in Southern California

Session: Sensors, Seismicity and Imaging [Poster]

Type: Poster

Date: 4/21/2021

Presentation Time: 11:30 AM Pacific

Description: 

White et al. (2019) developed an automated processing procedure to derive a catalog of earthquakes from raw seismic waveform data and applied it to nine years of data (2008 through 2016) from the augmented Anza Regional Network to analyze microseismicity in the San Jacinto Fault Zone (SJFZ) region in Southern California. The White et al. (2019) catalog has 1.6 times more events in a focused study region around the SJFZ than the standard regional catalog published by the Southern California Seismic Network. We are now updating our previous catalog through 2020 using a modified procedure that leverages recent advances in machine learning to detect seismic phase arrivals. We acquire data from 131 stations from five regional networks via the Incorporated Research Institutions for Seismology Data Management Center and process them using only open-source software. We account for 3D velocity structure when locating earthquakes by coupling the Fast Marching Method for solving the eikonal equation with a global-search algorithm for minimizing the L2 norm of data residuals. High-precision relative event locations are obtained using differential arrival times measured by cross-correlating waveforms and a double-difference algorithm. The final catalog will be useful for various studies of seismicity patterns in the SJFZ. We will present a progress report and catalog overview at the conference.

M. C. A. White et al., (2019). A Detailed Earthquake Catalog for the San Jacinto Fault‐Zone Region in Southern California. J. Geophy. Res.-Sol. Ea., 124, 6908–6930. doi: 10.1029/2019JB017641

Presenting Author: Malcolm C. A. White

Student Presenter: Yes

Authors