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Basic data features and results from a spatially dense seismic array on the San Jacinto fault zone

Ben-Zion, Yehuda and Vernon, Frank L. and Ozakin, Yaman and Zigone, Dimitri and Ross, Zachary E. and Meng, Haoran and White, Malcolm and Reyes, Juan and Hollis, Dan and Barklage, Mitchell (2015) Basic data features and results from a spatially dense seismic array on the San Jacinto fault zone. Geophysical Journal International, 202 (1). pp. 370-380. ISSN 0956-540X. doi:10.1093/gji/ggv142.

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We discuss several outstanding aspects of seismograms recorded during >4 weeks by a spatially dense Nodal array, straddling the damage zone of the San Jacinto fault in southern California, and some example results. The waveforms contain numerous spikes and bursts of high-frequency waves (up to the recorded 200 Hz) produced in part by minute failure events in the shallow crust. The high spatial density of the array facilitates the detection of 120 small local earthquakes in a single day, most of which not detected by the surrounding ANZA and regional southern California networks. Beamforming results identify likely ongoing cultural noise sources dominant in the frequency range 1–10 Hz and likely ongoing earthquake sources dominant in the frequency range 20–40 Hz. Matched-field processing and back-projection of seismograms provide alternate event location. The median noise levels during the experiment at different stations, waves generated by Betsy gunshots, and wavefields from nearby earthquakes point consistently to several structural units across the fault. Seismic trapping structure and local sedimentary basin produce localized motion amplification and stronger attenuation than adjacent regions. Cross correlations of high-frequency noise recorded at closely spaced stations provide a structural image of the subsurface material across the fault zone. The high spatial density and broad frequency range of the data can be used for additional high resolution studies of structure and source properties in the shallow crust.

Item Type:Article
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URLURL TypeDescription
Ben-Zion, Yehuda0000-0002-9602-2014
Ross, Zachary E.0000-0002-6343-8400
Additional Information:© The Author 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2015 March 26. Received 2015 March 25; in original form 2015 February 2. We are grateful to Bud Wellman for allowing us to deploy the instruments on his property. Geoff Davis, Jon Meyer, Pieter-Ewald Share, Xin Liu, Cooper Harris, Maxwell Dalquist, Hongrui Qiu, Valerie Sahakian and Nicholas Mancinelli helped with the field work. Rob Clayton and Paul Davis kindly provided the Betsy gun. The paper benefitted from useful comments by Philippe Roux, Gregor Hillers, two anonymous referees and editor Jeannot Trampert. The study was supported by the National Science Foundation grants EAR-0908903 (USC) and EAR-0908042 (UCSD).
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Guided waves, Seismic attenuation, Site effects, Seismic tomography, Wave scattering and diffraction, Wave propagation
Issue or Number:1
Record Number:CaltechAUTHORS:20190423-155306901
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Official Citation:Yehuda Ben-Zion, Frank L. Vernon, Yaman Ozakin, Dimitri Zigone, Zachary E. Ross, Haoran Meng, Malcolm White, Juan Reyes, Dan Hollis, Mitchell Barklage, Basic data features and results from a spatially dense seismic array on the San Jacinto fault zone, Geophysical Journal International, Volume 202, Issue 1, July, 2015, Pages 370–380,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94902
Deposited By: George Porter
Deposited On:24 Apr 2019 14:51
Last Modified:16 Nov 2021 17:08

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