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Crustal Rotation and Fluids: Factors for the 2019 Ridgecrest Earthquake Sequence?
Author(s) -
Tong Ping,
Yao Jiayuan,
Liu Qinya,
Li Tianjue,
Wang Kai,
Liu Shaolin,
Cheng YauWing,
Wu Shucheng
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl090853
Subject(s) - sinistral and dextral , geology , seismology , clockwise , shear (geology) , rotation (mathematics) , anisotropy , fault (geology) , shear zone , foreshock , geodesy , tectonics , geometry , petrology , aftershock , physics , mathematics , quantum mechanics
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.