Collaborative Research: RAPID: Capturing the Elgin-Lugoff earthquake swarm with a dense nodal array

合作研究：RAPID：用密集节点阵列捕捉埃尔金-卢戈夫地震群

• 批准号: 2303140
• 负责人: Daniel Frost
• 金额: $ 0.74万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-11-15 至 2024-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303140&HistoricalAwards=false
• 关键词: Collaborative; Research; RAPID; Capturing; Elgin

This RAPID project involves a seismic deployment of 86 Smartsolo 5Hz nodes to the epicenter region of the ongoing Elgin-Lugoff earthquake swarm sequence in South Carolina. This sequence started with a magnitude (M) 3.3 on December 27, 2021, in a region with relatively low background seismicity. This sequence appears to occur in several episodes, sometimes initiated by M 3+ events, and has up to months of gaps in between. While they occurred along the ancient Eastern Piedmont Fault System, a close examination of the earthquakes reveals that most of the events occurred in between the fault system. At this point, it is still not clear what is the driving force for this earthquake swarm and how long it will last.This deployment is timely, because this sequence is still ongoing, with no signs of ending soon. In addition, only one station was deployed within a few kilometers of the swarm. Such station distribution is not sufficient enough to provide a detailed high-resolution detection/relocation of microseismicity during an earthquake swarm, which are needed for better deciphering the spatio-temporal evolutions of the swarm sequence and their physical mechanisms. In addition, the seismic data collected in this deployment will be used to construct a velocity model of the local subsurface structure. Accurate seismic models are crucial particularly for developing ground motion models for seismic hazard assessment and delineating faultlocations. Up to 15 undergraduate/graduate students from both Georgia Tech and University of South Carolina will be involved in the nodal deployment. Data will be made available through the IRIS Data Management Center.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.

该 RAPID 项目涉及在南卡罗来纳州正在进行的埃尔金-卢戈夫地震群序列的震中区域部署 86 个 Smartsolo 5Hz 节点。该序列于 2021 年 12 月 27 日开始，震级为 3.3 级，位于背景地震活动相对较低的地区。该序列似乎发生在多个事件中，有时由 M 3+ 事件引发，并且之间有长达数月的间隙。虽然地震发生在古老的东部山前断层系统沿线，但对地震的仔细检查表明，大多数事件发生在断层系统之间。目前，尚不清楚这次地震群的驱动力是什么，会持续多久。这个部署是及时的，因为这个序列仍在继续，没有很快结束的迹象。此外，在虫群方圆几公里范围内只部署了一个站点。这样的台站分布不足以提供地震群期间微震活动的详细高分辨率检测/重定位，而这是更好地破译地震群序列的时空演化及其物理机制所必需的。此外，本次部署中收集的地震数据将用于构建局部地下结构的速度模型。准确的地震模型对于开发用于地震危险评估和描绘断层位置的地面运动模型尤其重要。来自佐治亚理工学院和南卡罗来纳大学的多达 15 名本科生/研究生将参与节点部署。数据将通过 IRIS 数据管理中心提供。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。