资源环境科技发展态势分析平台

The 2019 M6.4 Searles Valley, Southern California, earthquake nucleated on a buried right‐lateral fault segment and propagated around a perpendicular fault intersection to a surface‐outcropping left‐lateral segment, but it did not propagate coseismically to the intersecting fault of the subsequent M7.1 Ridgecrest mainshock. We use the 3D finite element method to explore the physical reasons for this curious rupture path. Rather than model the details of the measured and inferred slip distribution, we use simple constant‐traction assumptions to explore how initial stress, hypocenter location, and the depth of burial of the initial right‐lateral segment may have influenced rupture propagation. The results suggest that only a narrow range of fault stresses, fault burial depths, and hypocenter locations would result in the observed rupture path in this earthquake. The results may have implications for interactions between faults in Southern California and beyond.

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