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.

这个快速的项目涉及在南卡罗来纳州正在进行的Elgin-Lugoff地震群的震中地区进行86个Smartsolo 5Hz节点的地震部署。该序列始于2021年12月27日的幅度（m）3.3，位于具有相对较低的背景地震性的区域。该序列似乎发生在几个情节中，有时是由M 3+事件引发的，并且两者之间最多有几个月的差距。当它们发生在古代东部皮埃蒙特断层系统沿线时，对地震的仔细检查表明，大多数事件发生在断层系统之间。在这一点上，目前尚不清楚这次地震群的驱动力是什么，它将持续多久。这种部署是及时的，因为此序列仍在进行中，没有很快结束的迹象。此外，在群体几公里内仅部署了一个车站。这种站点的分布不足以提供地震群体中微观术的详细高分辨率检测/迁移，这是更好地解密群序列的时空演化所需的及其物理机制所需的。此外，本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地震危险评估和描述断层的地面运动模型特别是至关重要的。来自佐治亚理工学院和南卡罗来纳大学的最多15名本科/研究生将参与Nodal部署。该奖项将通过IRIS数据管理中心提供。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准来评估的值得支持的。