Crustal Rotation and Fluids: Factors for the 2019 Ridgecrest Earthquake Sequence?
Ping Tong, Jiayuan Yao, Qinya Liu, Tianjue Li, Kai Wang, Shaolin Liu, Yau‐Wing Cheng, Shucheng Wu
Abstract
Abstract P‐wave azimuthal anisotropic tomography reveals that the July 6, 2019 M w 7.1 Ridgecrest earthquake occurred in a region with clockwise crustal rotation. The rotation together with the sinistral slip on the Garlock Fault is a response to the northwest‐trending, dextral shear within the Eastern California Shear Zone due to the relative motion between the Pacific and North America Plates. The hypocentral area of the Ridgecrest mainshock is characterized by a sharp lateral velocity contrast which has a reversal in contrast polarity at about 5 km depth. We find high Vp/Vs ratio structures covering the rupture zones of the M w 6.4 foreshock and the M w 7.1 mainshock, which may indicate the existence of fluids in the fault zones. We speculate that fluids and crustal rotation may have played important mechanical roles in causing the 2019 Ridgecrest earthquake sequence.