Collaborative Research: Constraining next generation Cascadia earthquake and tsunami hazard scenarios through integration of high-resolution field data and geophysical models

该项目旨在增进对卡斯卡迪亚俯冲带沿岸海啸危害的了解。卡斯卡迪亚俯冲带是美国太平洋西北部地震和海啸的主要震源。这项工作将绘制保存在地质记录中的古代海啸沉积图，并将这些数据与先进的模型结合起来，模拟海啸对海岸的影响。这些结果将加深对该地区过去地震行为的理解。具体的焦点将是该地区上一次发生在1700年的大地震。这项研究将直接影响该地区的公共安全和准备工作。所获得的见解将有助于改进危险地图、应急和疏散计划、建筑规范以及海啸疏散结构的设计。此外，该项目还将支持与浅水湾部落的合作。该部落已经建造了北美第一座独立的海啸疏散塔，这次合作将有助于促进社区对地震风险的参与和教育。通过这项工作，该项目将成为公共安全和知识传播的重要投资。该项目的目标是对卡斯卡迪亚俯冲带(CSZ)进行全面的研究，重点是公元1700年左右的地震和海啸活动。为了实现这一目标，该团队将对CSZ沿线两个关键地点的古海啸沉积物进行高分辨率测绘，并执行数千个先进的海啸淹没模型。这些努力的目的是测试各种假设，即什么样的地震滑动分布可以解释实际的现场观测，填补目前对海啸沉积物分布的了解的空白。通过使用分析沉积物岩心、微化石和沉积物地球化学等创新技术，结果将以高分辨率描绘出这些新地点海啸淹没的全部范围。这种方法将有助于验证或排除不同的地震情景，并有助于更准确地了解CSZ的地震行为。这项研究是准确绘制地震和海啸地图的基础，并对实际灾害应用具有广泛的影响。该奖项反映了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 project aims to advance knowledge of tsunami hazards along the Cascadia subduction zone. The Cascadia subduction zone is the main source for earthquakes and tsunamis in the US Pacific Northwest. This work will map ancient tsunami deposits preserved in the geologic record and combine this data with advanced models to simulate tsunami impacts along the coast. These results will deepen understanding of how past earthquakes have behaved in this region. The specific focus will be on the last major earthquake in the region that occurred in the year 1700. This research will directly impact public safety and preparedness in the region. The insights gained will help to improve hazard maps, emergency and evacuation plans, building codes, and the design of tsunami evacuation structures. Furthermore, the project will support a collaboration with the Shoalwater Bay Tribe. This tribe has built North America's first free-standing tsunami evacuation tower, and the collaboration will help to advance community engagement and education regarding seismic risks. Through ths work, this project will serve as a vital investment in public safety and knowledge dissemination. The objective of this project is to conduct a comprehensive study of the Cascadia subduction zone (CSZ), focusing on the seismic and tsunami activity around the year 1700 CE. To accomplish this, the team will carry out high-resolution mapping of paleotsunami deposits at two key locations along the CSZ and execute thousands of advanced tsunami inundation models. These efforts aim to test various hypotheses of what kinds of earthquake slip distributions can explain actual field observations, addressing gaps in the current understanding of tsunami deposit distribution. By employing innovative techniques such as analyzing sediment cores, microfossils, and sediment geochemistry, the results will delineate the full extent of tsunami inundation with high resolution at these new sites. This approach will help in validating or excluding different earthquake scenarios and contribute to a more precise understanding of the CSZ's seismic behavior. This research is fundamental for accurate seismic and tsunami mapping and has wide-ranging implications for practical hazard applications.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.