RAPID proposal: Rapid seismic response to the July 2019 Mw 7.1 and 6.4 doublet near Ridgecrest, Southern California

这一快速项目是对南加州2019年7月发生的两次里奇克雷斯特地震的地震反应。地震发生在圣安德烈亚斯断层南部和加洛克断层附近。这是一个人口稠密的地区，如果这些断层上发生地震，可能会造成重大破坏。虽然Ridgecrest的人口较少，但了解这些地震可以帮助我们更好地更广泛地了解南加州的地震危险，它也可以帮助我们了解大地震是如何演变的，以及是什么物理控制了这些事件。这次实验将在地震破裂周围迅速部署20台地震仪器。这些增加的台站将提高我们记录两次主震余震的能力。该项目的更广泛影响包括支持学生接受科学应对地震的培训，以及提高对南加州地震危险的了解。这次试验的数据将通过IRIS的地震数据设施公开。这一部署在7.1和6.4兆瓦里奇克雷斯特地震震中周围的20个地震台将用于确定详细的断层结构、可能的地震触发和余震发生。该项目将与美国地质勘探局合作，部署短周期和强地震动站的组合。这一结果还可以为该地区高分辨率地震速度结构、震后变形和应力演化提供信息。最终，这可能会提高对加洛克和圣安德烈亚斯断层附近地震潜力的理解。这一裁决反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This RAPID project is a seismic response to the two July 2019 Ridgecrest earthquakes in southern California. The earthquakes occurred close to the southern San Andreas fault and the Garlock fault. This is a heavily populated area that could sustain significant damage if earthquakes happened on those faults. While Ridgecrest is less populated, understanding these earthquakes can help us to better understand the seismic hazard more broadly in southern California, it can also help us to understand how large earthquake evolve and what physics governs these events. This experiment will rapidly deploy 20 seismic instruments around the earthquake ruptures. These additional stations will improve our ability to record aftershocks from the two mainshocks. The broader impacts of the project include support for students to be trained in scientific response to earthquakes and an improved understanding of seismic hazard in southern California. The data from this experiment will be made publicly available through the seismic data facility at IRIS.This deployment of 20 seismic stations around the epicenter of the Mw 7.1 and Mw6.4 Ridgecrest earthquakes will be used to determine the detailed fault structure, possible earthquake triggering, aftershock occurrence. The project will deploy a combination of short period and strong ground motion stations in collaboration with the USGS. Results may also inform high resolution seismic velocity structure, postseismic deformation and the evolution of stress in the region. Ultimately this may improve understanding of seismic potential on the Garlock and San Andreas faults which are in close proximity.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.