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.

中文翻译：

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地壳旋转和流体：2019年里奇克莱斯特地震序列的因素？

P波方位各向异性断层扫描显示，2019年7月6日中号_W¯¯ 7.1里奇克莱斯特地震发生在顺时针旋转的地壳区域。由于太平洋板块和北美板块之间的相对运动，加洛克断裂带上的旋转和左旋滑动是对东加利福尼亚剪切带内西北趋势的右旋剪切的一种响应。Ridgecrest主震的震中区域的特点是明显的横向速度反差，在约5 km深度处反差极性相反。我们发现高Vp / Vs比结构覆盖了M _w 6.4前震和M _w的破裂带7.1主震，可能表明断层带中存在流体。我们推测，流体和地壳旋转可能在引起2019年里奇克莱斯特地震序列中起了重要的机械作用。