Monitoring Seasonal Shear Wave Velocity Changes in the Top 6 m at Garner Valley in Southern California With Borehole Data
Name
Geophysical Research Letters - 2022 - Qin - Monitoring Seasonal Shear Wave Velocity Changes in the Top 6 m at Garner Valley.pdf
Description
Published version
Size
3.16 MB
Format
Adobe PDF
Checksum (MD5)
67d9dd0cc122d222c3583863a47be765
Author(s)
Qin, Lei
Steidl, Jamison H
Qiu, Hongrui
Nakata, Nori
Ben‐Zion, Yehuda
Date Issued
December 5, 2022
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Qin, L., Steidl, J. H., Qiu, H., Nakata, N., & Ben-Zion, Y. (2022). Monitoring seasonal shear wave velocity changes in the top 6 m at Garner Valley in southern California with borehole data. Geophysical Research Letters, 49, e2022GL101189.
Version
Final published version
Abstract
Subsurface structures play important roles in seismic ground motion, crustal hydrology, stability of the built environment, and more. Constraining temporal changes of subsurface shear wave velocity (VS) can provide useful information to all these topics and the growing field of hydrological monitoring with seismic velocity. Using borehole records at Garner Valley, CA, we estimate seasonal subsurface VS variations from impulse response functions (IRFs) of earthquake data (2005–2018) along with IRFs and cross-correlation of cross-hole experiment data (2015–2018). The inferred VS variations are up to ∼25% in the top 6 m and ∼10% at 2–5 m in depth. The VS variations correlate strongly with the water table depth changes, suggesting that the changes are mostly due to fluctuations of pore pressure in the shallow material. The shallow velocity changes alter the near-surface conditions, can affect seismic hazard estimation, and may be improperly attributed to deeper processes without careful analysis.
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/10.1029/2022gl101189
