Monitoring Seasonal Shear Wave Velocity Changes in the Top 6 m at Garner Valley in Southern California With Borehole Data

Abstract Subsurface structures play important roles in seismic ground motion, crustal hydrology, stability of the built environment, and more. Constraining temporal changes subsurface shear wave velocity ( V S ) can provide useful information to all these topics growing field hydrological monitoring with velocity. Using borehole records at Garner Valley, CA, we estimate seasonal variations from impulse response functions (IRFs) earthquake data (2005–2018) along IRFs cross‐correlation cross‐hole experiment (2015–2018). The inferred are up ∼25% top 6 m ∼10% 2–5 depth. correlate strongly water table depth changes, suggesting that mostly due fluctuations pore pressure shallow material. alter near‐surface conditions, affect hazard estimation, may be improperly attributed deeper processes without careful analysis.