Internal Structure of the Central Garlock Fault Zone From Ridgecrest Aftershocks Recorded by Dense Linear Seismic Arrays
Name
Geophysical Research Letters - 2023 - Qiu - Internal Structure of the Central Garlock Fault Zone From Ridgecrest.pdf
Description
Published version
Size
1.95 MB
Format
Adobe PDF
Checksum (MD5)
005726dea81d8116f3580a4ee7f06574
Author(s)
Qiu, Hongrui
Chi, Benxin
Ben‐Zion, Yehuda
Date Issued
January 9, 2023
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Qiu, H., Chi, B., & Ben-Zion, Y. (2023). Internal structure of the central Garlock fault zone from Ridgecrest aftershocks recorded by dense linear seismic arrays. Geophysical Research Letters, 50, e2022GL101761.
Version
Final published version
Abstract
We provide high-resolution seismic imaging of the central Garlock fault using data recorded by two dense seismic arrays that cross the Ridgecrest rupture zone (B4) and the Garlock fault (A5). Analyses of fault zone head waves and P-wave delay times at array A5 show that the Garlock fault is a sharp bimaterial interface with P waves traveling ∼5% faster in the northern crustal block. The across-fault velocity contrast agrees with regional tomography models and generates clear P-wave reflections in waveforms recorded by array B4. Kirchhoff migration of the reflected waves indicates a near-vertical fault between 2 and 6 km depth. The P-wave delay times imply a ∼300-m-wide transition zone near the Garlock fault surface trace beneath array A5, offset to the side with faster velocities. The results provide important constraints for derivations of earthquake properties, simulations of ruptures and ground motion, and future imaging studies associated with the Garlock fault.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution-NonCommercial
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2022gl101761
