EAR-PF Late Quaternary slip rates and paleoseismicity of the Sevier Desert Detachment: earthquake hazards of a low-angle normal fault

Timothy Stahl博士被授予NSF EAR博士后奖学金，通过密歇根大学进行研究和实地教育计划。他将研究犹他州中部的一个低角度正断层——塞维尔沙漠支系（SDD）的古地震活动性和发震潜力。本项目旨在(1)建立SDD的长期滑移率；(2)确定SDD上过去地震的时间和震级；(3)建立SDD上多段或多断层破裂的概率模型，以及断层在深部溶入SDD的概率模型。斯塔尔博士将结合野外测绘、地面激光扫描、宇宙地表暴露年龄测年、古地震挖沟和数值模拟来实现上述研究目标。这是第一个对陆地上史前地震的时间和震级进行实地调查的研究。这项研究将阐明这些断层在美国和世界范围内造成的有争议的和潜在的破坏性地震危险。该奖学金支持密歇根大学和位于犹他州中部的两年制本科学院斯诺学院的本科生开展实地合作研究项目。斯塔尔博士还将带领密歇根大学的学生在新西兰进行为期一个月的实地考察营，新西兰是他博士研究的东道国，旨在扩大对世界各地不同构造背景的认识，并建立美国和新西兰本科生之间的国际联系。

Dr. Timothy Stahl has been awarded an NSF EAR Postdoctoral Fellowship to conduct a research and field-based education program through the University of Michigan. He will investigate the paleoseismicity and seismogenic potential of the Sevier Desert Detachment (SDD)- a low-angle normal fault (LANF) in central Utah. This project aims to (1) establish the long-term slip rates of the SDD; (2) determine the timing and magnitude of past earthquakes on the SDD; (3) model the probability of multi-segment or multi-fault ruptures on the SDD and faults soling into it at depth. Dr. Stahl will use a combination of field mapping, terrestrial laser scanning, cosmogenic surface exposure-age dating, paleoseismic trenching, and numerical modeling to meet the above research aims.This is the first study to examine field evidence for the timing and magnitude of prehistoric earthquakes on a LANF. The research will elucidate the controversial and potentially devastating seismic hazard posed by these faults in the US and worldwide. The fellowship supports the development of field-based, collaborative research projects for undergraduates at the U. Michigan and Snow College, a two-year undergraduate college in central Utah. Dr. Stahl will also lead a one-month field camp for U. Michigan students in New Zealand, the host country of his PhD studies, aimed at broadening knowledge of different tectonic settings around the world and establishing international connections between USA and New Zealand undergraduate students.