SUMMARY We derive a detailed earthquake catalogue and Vp, Vs and Vp/Vs models for the region around the 2019 Mw 6.4 and Mw7.1 Ridgecrest, California, earthquake sequence using data recorded by rapid-response, densely deployed sensors following the Ridgecrest main shock and the regional network. The new catalogue spans a 4-month period, starting on 1 June 2019, and it includes nearly 95 000 events detected and located with iterative updates to our velocity models. The final Vp and Vs models correlate well with surface geology in the top 4 km of the crust and spatial seismicity patterns at depth. Joint interpretation of the derived catalogue, velocity models, and surface geology suggests that (i) a compliant low-velocity zone near the Garlock Fault arrested the Mw 7.1 rupture at the southeast end; (ii) a stiff high-velocity zone beneath the Coso Mountains acted as a strong barrier that arrested the rupture at the northwest end and (iii) isolated seismicity on the Garlock Fault accommodated transtensional-stepover strain triggered by the main events. The derived catalogue and velocity models can be useful for multiple future studies, including further analysis of seismicity patterns, derivations of accurate source properties (e.g. focal mechanisms) and simulations of earthquake processes and radiated seismic wavefields.

中文翻译：

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使用密集快速响应地震数据的 2019 年加利福尼亚州 Mw7.1 里奇克莱斯特地震的详细走时层析成像和地震目录

总结 我们使用在 Ridgecrest 主震后快速响应、密集部署的传感器记录的数据，为 2019 Mw 6.4 和 Mw7.1 加利福尼亚州 Ridgecrest 附近地区的地震序列推导出详细的地震目录和 Vp、Vs 和 Vp/Vs 模型和区域网络。新目录从 2019 年 6 月 1 日开始，为期 4 个月，其中包括检测和定位的近 95,000 个事件，并对我们的速度模型进行迭代更新。最终的 Vp 和 Vs 模型与地壳顶部 4 公里的地表地质和深度的空间地震活动模式具有很好的相关性。对衍生目录、速度模型和地表地质学的联合解释表明，(i) Garlock 断层附近的顺应性低速带在东南端阻止了 Mw 7.1 破裂；(ii) Coso 山脉下方的一个坚硬的高速带充当了强大的屏障，阻止了西北端的破裂；(iii) Garlock 断层上的孤立地震活动适应了主要事件引发的跨张跨步应变。导出的目录和速度模型可用于未来的多项研究，包括进一步分析地震活动模式、推导准确的震源特性（例如震源机制）以及地震过程和辐射地震波场的模拟。