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Title: Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array

Journal Article · · Geophysical Journal International
DOI:https://doi.org/10.1093/gji/ggx096· OSTI ID:1535648
 [1];  [1];  [2];  [1];  [3]
  1. Univ. of Southern California, Los Angeles, CA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Univ. of California, San Diego, CA (United States)
+ Show Author Affiliations

The internal structure of the Clark fault in the trifurcation area of the San Jacinto fault zone is imaged using seismograms recorded by a dense linear array (Jackass Flat, JF) crossing the surface trace of the fault and an adjacent array (TR) to the SW. Delay times between phase arrivals associated with ~3500 local earthquakes and nine teleseismic events are used to estimate velocity variations within the arrays. The teleseismic P waves travel faster beneath the TR than the JF array, in contrast to larger scale tomographic results. Statistical analysis of local P-wave delay times indicates that the entire JF array, with an aperture of ~400 m, is inside a low-velocity damage zone. This low-velocity zone is bounded on the NE side by a shallow bimaterial interface generating fault zone head waves, and it contains an inner zone of more intense damage generating fault zone trapped waves. The P-wave velocity contrast across the local bounding bimaterial interface is 10–15 per cent. The trapping structure is associated with a width of ~200 m, S-wave velocity reduction of ~35 per cent with respect to the surrounding rock, Q-value of ~20 and depth of ~3.5 km. The imaging results suggest that the main seismogenic fault is near the SW end of the JF array, in agreement with a prominent geomorphologic feature. The existence of intense local damage on the crustal block with faster larger scale velocity at depth is consistent with common propagation of earthquake ruptures in the area to the NW.

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)
Grant/Contract Number:
SC0016520; SC0016527
OSTI ID:
1535648
Journal Information:
Geophysical Journal International, Vol. 209, Issue 3; ISSN 0956-540X
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (12)

Spatiotemporal Variations of Stress and Strain Parameters in the San Jacinto Fault Zone journal November 2018
Diverse Volumetric Faulting Patterns in the San Jacinto Fault Zone journal June 2018
Wave-Equation Dispersion Inversion of Guided P Waves in a Waveguide of Arbitrary Geometry journal September 2018
Imaging subsurface structures in the San Jacinto fault zone with high-frequency noise recorded by dense linear arrays journal February 2019
Temporal changes of seismic velocities in the San Jacinto Fault zone associated with the 2016 Mw 5.2 Borrego Springs earthquake journal November 2019
Imaging the Fault Damage Zone of the San Jacinto Fault Near Anza With Ambient Noise Tomography Using a Dense Nodal Array journal November 2019
A Detailed Earthquake Catalog for the San Jacinto Fault‐Zone Region in Southern California journal July 2019
Eikonal Tomography of the Southern California Plate Boundary Region journal September 2019
A Bimaterial Interface Along the Northern San Jacinto Fault Through Cajon Pass journal November 2018
Comparisons of in situ Vp/Vs ratios and seismic characteristics between northern and southern California journal February 2022
Structural Properties of the San Jacinto Fault Zone at Blackburn Saddle from Seismic Data of a Dense Linear Array journal September 2018
Seismic Imaging of the Southern California Plate Boundary around the South-Central Transverse Ranges Using Double-Difference Tomography journal November 2018

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58 GEOSCIENCES
Geochemistry & Geophysics