RAPID: Collaborative Proposal: Response to the Searles Valley Earthquake Sequence

该项目将支持与东加州剪切带Searles Valley地震序列相关的快速地质，大地测量和地震现场调查，其中包括2019年7月4日的6.4级地震和随后的7月5日的7.1级地震。由于地震和大地测量信号随时间迅速衰减，地质证据很快变得模糊不清，因此必须立即作出现场反应。快速现场研究应提供丰富的数据，以促进了解地震破裂特性和断层破坏区，三维地壳结构周围的破裂，地震后瞬变的大地测量领域，和影响的事件对地下和人类结构。这项研究将有助于澄清在高度活跃和复杂的东加州剪切带，在过去的三十年中举办了三个7级地震的地震过程和结构，并有助于提高对构造变形和地震危险性在南加州的理解显着。 实地研究和记录的数据将为学生和早期职业科学家提供宝贵的经验，并为教育和推广活动提供优秀的材料，这项研究将包括获得差分激光雷达和光学图像调查，全球定位系统运动测量，跨断层线性和二维阵列的地震部署，以及地面运动对基础设施的测绘效果。获得的多学科观测结果将使研究人员能够解决地震破裂、地震活动时空模式、断层带和地壳结构、地震强度和震后变形等众多悬而未决的问题。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project will support rapid geologic, geodetic and seismological field investigations associated with the Searles Valley earthquake sequence in the Eastern California Shear Zone, which included a magnitude (M) 6.4 earthquake on July 4, 2019, and a subsequent M 7.1 event on July 5. The immediate field response is essential because the seismic and geodetic signals decay rapidly with time and geological evidence becomes obscure quickly. Rapid field studies should provide a wealth of data to facilitate understanding of the earthquake rupture properties and fault damage zones, 3D crustal structures around the ruptures, post seismic transients of geodetic fields, and effects of the events on the subsurface and human structures. This study should help clarify earthquake processes and structures in the highly active and complex Eastern California Shear Zone, which hosted three M 7 events in the last three decades, and contribute significantly to improved understanding of the tectonic deformation and seismic hazard in Southern California. The field studies and recorded data will provide valuable experience for students and early career scientists, and produce excellent material for education and outreach activities.This study will include obtaining differential lidar and optical image surveys, campaign Global Positioning System measurements, seismic deployments of across-fault linear and 2D arrays, and mapping effects of the ground motion on infrastructure. The obtained multi-disciplinary observations will enable researchers to address numerous outstanding questions about earthquake ruptures, spatio-temporal seismicity patterns, fault zone and crustal structures, intensity of ground shaking and postseismic deformation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.