Temporal Seismic Velocity Variations: Recovery Following From the 2019 <i>M</i>_w 7.1 Ridgecrest, California Earthquake

Abstract We investigated seismic velocity changes ( dv / v ) associated with the 2019 Ridgecrest earthquake sequence high‐frequency autocorrelations of ambient noise data. Daily autocorrelation functions were computed for entirety and first quarter 2020 broadband stations within region, including temporary installed during aftershock deployment. Travel time shifts in daily functions, relative to mean waveform, produce series, which are sensitive evolving material properties shallow crust surrounding fault zone (RFZ). A short‐term drop follows M w 7.1 at vicinity rupture surface, while those greater than 50 km away showed no such drop. The maximum, absolute proportional logarithm distance from peak dynamic strain experienced earthquake. Near areas highest coseismic slip RFZ, velocities recovered over 3 months. However, nearby Garlock fault, where triggered manifested, north a month. interpret their recovery be largely due physical crust, as damage caused by process response large stresses passing waves mainshock.