RAPID: Assessing Thermal and Chemical Response of Hot-springs to Puerto Rico’s Continuing 2020 Seismic Sequence

波多黎各科阿莫温泉的温度和流量随着持续的地震活动而迅速变化。地下水系统经常受到地震的影响，因为裂缝网可以在地面运动中打开、关闭或重新排列。了解地震活动与地下水变化之间的联系，对于水资源管理、废水储存/注入以及洪水灾害评估越来越重要。该项目将支持2-3名本科生和1名研究生持续监测现场，每天收集水样进行化学分析。这些学生还将有机会在全国会议上展示他们的研究成果。这项研究的结果，结合有关当地地质的信息，也将用于制作教育宣传材料，提供给在温泉的公众。该项目将使用地震记录、温度、水化学和流量的综合数据集，以更好地了解Coamo温泉的水文变化，以响应附近但独立的断层系统上正在进行的地震序列。为此，pi将生成一个持续一年的连续数据集，包括正在进行的地震序列期间温泉的温度、流量和水化学（阳离子、阴离子、微量金属、δD和δ18O）。每分钟记录一次温度测量，每天收集水样，每天测量排放量。这些数据将与同期地震数据一起用于探索地震活动的短期和长期水文响应。该奖项反映了美国国家科学基金会的法定使命，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。

The temperature and discharge of the Coamo hot springs in Puerto Rico have rapidly changed in response to ongoing seismic activity. Groundwater systems are often affected by earthquakes as networks of fractures can be opened, closed, or rearranged during ground motion. Understanding any links between seismic activity and changes to groundwater is increasingly important for managing water resources, wastewater storage/injection, and assessing flooding hazards. This project will support 2-3 undergraduate students and one graduate student to continuously monitor the site and collect daily water samples for chemical analyses. These students will also be provided the opportunity to present their findings at a national conference. The results of this study, combined with information about the local geology, will also be used to create educational outreach materials to be provided to the public at the hot springs. This project will use a combined dataset of seismic records, temperature, water chemistry, and discharge to better understand the hydrologic changes to the Coamo hot springs in response to an ongoing seismic sequence on a nearby but separate fault system. To do this, the PIs will generate a year-long continuous dataset of temperature, discharge, and water chemistry (cations, anions, trace metals, δD, and δ18O) of the hot springs during the ongoing seismic sequence. Temperature measurements will be recorded every minute, water samples will be collected daily, and discharge will be measured daily. These data will be used with contemporaneous seismic data to explore both the short- and long-term hydrologic response to seismic activity.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.