The 2019 Ridgecrest, California, earthquake sequence produced observable crustal deformation over much of central and southern California, as well as surface rupture over several tens of kilometers. To obtain a detailed picture of the fault slip involved in the 4 July M 6.4 foreshock and 6 July M 7.1 mainshock, we combine strong‐motion seismic waveforms with crustal deformation observations to obtain kinematic and static slip models of both events. We sample the regional seismic wavefield for both the foreshock and mainshock with three‐component records from 31 stations of the California Integrated Seismic Network. The deformation observations include Global Positioning System (GPS), Interferometric Synthetic Aperture Radar (InSAR), and borehole strainmeter recordings of the dynamic strain field. These data collectively constrain the kinematic coseismic slip distributions of the events, with measurements variously observing coseismic slip from one event (e.g., seismic waveforms, kinematic solutions from continuous GPS, and strainmeter time series) or coseismic slip from both events combined (InSAR). We find that the foreshock ruptured two separate faults, one with left‐lateral strike slip on a northeast–southwest‐trending fault and the other with right‐lateral strike slip on an orthogonal fault, with unilateral rupture propagation along both. The mainshock ruptured a series of northwest–southeast‐trending faults with right‐lateral strike slip concentrated in the uppermost 6 km with exceptionally low‐rupture velocity averaging 1.0–1.5 km/s⁠. A possible explanation for the low‐rupture velocity is that the mainshock rupture expended relatively high energy, generating secondary fractures in off‐fault deformation, which is consistent with field and seismic evidence of plastic deformation on small fault strands adjacent to the main rupture trace.

中文翻译：

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与2019年7月4日至6日有关的断层滑移运动学，加利福尼亚州里奇克莱斯特，地震序列

2019年加利福尼亚州里奇克莱斯特的地震序列在加利福尼亚州中部和南部的大部分地区产生了可观察到的地壳变形，并且在数十公里处产生了地表破裂。为了获得7月4日M 6.4前震和7月6日M 7.1主震所涉及的断层滑动的详细情况，我们将强运动地震波形与地壳形变观测值相结合，以获得两个事件的运动和静态滑动模型。我们使用来自加利福尼亚综合地震台网31个台站的三分量记录对前震和主震的区域地震波场进行采样。变形观测包括全球定位系统（GPS），干涉合成孔径雷达（InSAR）和动态应变场的井眼应变仪记录。这些数据共同约束事件的运动同震滑动分布，并通过测量以各种方式观察一个事件的同震滑动（例如，地震波形，来自连续GPS的运动学解以及应变仪时间序列）或来自两个事件组合的同震滑动（InSAR）。我们发现前震破裂了两个单独的断层，一个在东北-西南走向的断层上具有左旋走滑，另一个在正交的断层上具有右旋走滑，均沿这两个方向单侧破裂扩展。主震破裂了一系列西北-东南向断裂，右旋走滑集中在最上部的6 km，异常低的破裂速度平均为1.0-1.5 km / s。