Shallow three-dimensional structure of the San Jacinto fault zone revealed from ambient noise imaging with a dense seismic array
Abstract
In this work, we use 1 month of continuous seismic waveforms from a very dense seismic network to image with unprecedented resolution the shallow damage structure of the San Jacinto fault zone across the Clark fault strand. After calculating noise correlations, high apparent velocity arrivals coming from below the array are removed using a frequency–wavenumber filter. This is followed by a double-beamforming analysis on multiple pairs of subarrays to extract phase and group velocity information across the study area. The phase and group velocity dispersion curves are regionalized into phase and group velocity maps at different frequencies, and these maps are inverted using a neighbourhood algorithm to build a 3-D shear wave velocity model around the Clark fault down to ~500 m depth. The model reveals strong lateral variations across the fault strike with pronounced low-velocity zones corresponding to a local sedimentary basin and a fault zone trapping structure. The results complement previous earthquake- and seismic noise-based imaging of the fault zone at greater depth and clarify properties of structural features near the surface.
- Authors:
-
[1];
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. Grenoble-Alpes (UGA) (France)
- Univ. of Southern California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Southern California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); Defi Imag’In CNRS
- OSTI Identifier:
- 1612606
- Grant/Contract Number:
- SC0016520; EAR-1415907; PLR-1643761; EAR-1551411
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Journal International
- Additional Journal Information:
- Journal Volume: 216; Journal Issue: 2; Journal ID: ISSN 0956-540X
- Publisher:
- Oxford University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Geochemistry & geophysics; Seismic interferometry; Seismic tomography; Surface waves and free oscillations; Wave propagation; Wave scattering and diffraction
Citation Formats
Mordret, Aurélien, Roux, Philippe, Boué, Pierre, and Ben-Zion, Yehuda. Shallow three-dimensional structure of the San Jacinto fault zone revealed from ambient noise imaging with a dense seismic array. United States: N. p., 2018.
Web. doi:10.1093/gji/ggy464.
Mordret, Aurélien, Roux, Philippe, Boué, Pierre, & Ben-Zion, Yehuda. Shallow three-dimensional structure of the San Jacinto fault zone revealed from ambient noise imaging with a dense seismic array. United States. https://doi.org/10.1093/gji/ggy464
Mordret, Aurélien, Roux, Philippe, Boué, Pierre, and Ben-Zion, Yehuda. Thu .
"Shallow three-dimensional structure of the San Jacinto fault zone revealed from ambient noise imaging with a dense seismic array". United States. https://doi.org/10.1093/gji/ggy464. https://www.osti.gov/servlets/purl/1612606.
@article{osti_1612606,
title = {Shallow three-dimensional structure of the San Jacinto fault zone revealed from ambient noise imaging with a dense seismic array},
author = {Mordret, Aurélien and Roux, Philippe and Boué, Pierre and Ben-Zion, Yehuda},
abstractNote = {In this work, we use 1 month of continuous seismic waveforms from a very dense seismic network to image with unprecedented resolution the shallow damage structure of the San Jacinto fault zone across the Clark fault strand. After calculating noise correlations, high apparent velocity arrivals coming from below the array are removed using a frequency–wavenumber filter. This is followed by a double-beamforming analysis on multiple pairs of subarrays to extract phase and group velocity information across the study area. The phase and group velocity dispersion curves are regionalized into phase and group velocity maps at different frequencies, and these maps are inverted using a neighbourhood algorithm to build a 3-D shear wave velocity model around the Clark fault down to ~500 m depth. The model reveals strong lateral variations across the fault strike with pronounced low-velocity zones corresponding to a local sedimentary basin and a fault zone trapping structure. The results complement previous earthquake- and seismic noise-based imaging of the fault zone at greater depth and clarify properties of structural features near the surface.},
doi = {10.1093/gji/ggy464},
journal = {Geophysical Journal International},
number = 2,
volume = 216,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2018},
month = {Thu Nov 01 00:00:00 EDT 2018}
}
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