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Title: Imaging subsurface structures in the San Jacinto fault zone with high-frequency noise recorded by dense linear arrays

Journal Article · · Geophysical Journal International
DOI:https://doi.org/10.1093/gji/ggz069· OSTI ID:1495610
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6]
  1. Institut de Physique du Globe de Strasbourg, Université de Strasbourg, EOST, CNRS UMR7516, F-67084 Strasbourg, France
  2. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, USA
  3. Institut de Physique du Globe de Strasbourg, Université de Strasbourg, EOST, CNRS UMR7516, F-67084 Strasbourg, France, Géosciences Environnement Toulouse, Observatoire Midi-Pyrénées, CNRS UMR5563, Université Paul Sabatier, F-31400 Toulouse, France
  4. Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS, IRD, BP 53, F-38041 Grenoble, France
  5. Institute of Seismology, University of Helsinki, FI-00014 Helsinki, Finland
  6. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
+ Show Author Affiliations

Cross-correlations of 2–35 Hz ambient seismic noise recorded by three linear arrays across the San Jacinto Fault Zone (SJFZ) in Southern California are used to derive high-resolution shear wave velocity models for the top 50–90 m of the crust at the array locations. Coherent Rayleigh surface waves are inverted to construct 2-D maps of group velocities in the range 0.2–0.6 km s-1. These maps are inverted to shear wave velocities around the fault using a Markov Chain Monte Carlo approach. The results show marked low-velocity zones in the top 20–30 m with velocity reduction up to 35 per cent and shallow flower structures at depth shallower than 50 m. The derived velocities, location of low-velocity zone with respect to main surface traces and shape with depth are generally consistent with borehole measurements and previous imaging of deeper sections of the SJFZ at the same sites or nearby. Here, the imaging technique requires only ~30 d of data (90 per cent of the signal-to-noise ratio is obtained in 15 d) and it bridges an observational gap between surface geology and typical tomography studies with no resolution in the top 100 m.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0016520; SC0016527; EAR-1261681; EAR-0908903; EAR-162061
OSTI ID:
1495610
Alternate ID(s):
OSTI ID: 1612610
Journal Information:
Geophysical Journal International, Journal Name: Geophysical Journal International Vol. 217 Journal Issue: 2; ISSN 0956-540X
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Related Subjects

58 GEOSCIENCES
geochemistry & geophysics
seismic tomography
interferometry
wave scattering and diffraction
wave propagation
rheology and friction of fault zones