Evaluating Temporal Variations in Fault Slip-Rate and Fault Interaction in the Eastern California shear zone

评估东加州剪切带断层滑移率和断层相互作用的时间变化

• 批准号: 0847990
• 负责人: Colin Amos
• 金额: $ 16万
• 依托单位: Amos Colin B
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0847990&HistoricalAwards=false
• 关键词: Evaluating; Temporal; Variations; Fault; Slip

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr. Colin Amos has been granted an NSF Earth Sciences postdoctoral fellowship to develop an integrated program of research and education at the University of California, Berkeley. The project will quantify active deformation at multiple geologic timescales for faults in Eastern California. The Little Lake fault, one of the primary structures in eastern California responsible for transferring Pacific-North American plate motion will be the focus of this study. A series of lava flows and dry river channels incised by the ancient Owens Lake drainage system is displaced by the Little Lake fault and permits reconstruction of past fault movements at timescales of ~10,000-100,000 years. Reconstruction of the Late Quaternary ? Holocene record of slip on this fault zone will involve: 1) characterization of offset landforms through geomorphic and neotectonic mapping, 2) quantification of fault displacements with high-resolution topographic surveying, and 3) establishing chronologic constraints through cosmogenic radionuclide dating. This reconstruction will provide the first direct comparison with high rates of geodetically measured strain along the Little Lake fault and will elucidate the degree to which strain transients may modulate fault slip and earthquake activity within the Eastern California shear zone. The results of this work will be incorporated into laboratory exercises as part of a larger introductory field geology course aimed at reaching non-science majors at UC Berkeley. Additionally, a series of public, scientific lectures will be presented at the UC White Mountain Research Station in Bishop, CA. These lectures will serve as a vehicle for raising awareness and disseminating information on the local seismic hazards to community members and policy makers at direct risk from earthquakes in the Eastern California shear zone.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。科林·阿莫斯博士已被授予NSF地球科学博士后奖学金，在加州大学伯克利分校开发研究和教育的综合计划。该项目将量化加州东部断层在多个地质时间尺度上的活动变形。小湖断层是加州东部的主要构造之一，负责传递太平洋-北美板块运动，将是本研究的重点。一系列的熔岩流和干涸的河道被古老的欧文斯湖排水系统切割，被小湖断层取代，并允许重建过去的断层运动，时间尺度为10，000 - 100，000年。晚第四纪的重建？该断裂带上的全新世滑动记录将包括：1）通过地貌和新构造测绘来表征偏移地貌，2）通过高分辨率地形测量来量化断层位移，以及3）通过宇宙成因放射性核素测年来建立年代学约束。该重建将首次直接与沿沿着小湖断层的大地测量应变进行比较，并将阐明应变瞬变可能在多大程度上调制东加州剪切带内的断层滑动和地震活动。这项工作的结果将被纳入实验室练习，作为旨在达到加州大学伯克利分校非科学专业的更大的介绍性地质课程的一部分。此外，一系列的公共，科学讲座将在加州大学白色山研究站在主教，加利福尼亚州。这些讲座将作为一种手段，提高认识和传播有关当地地震灾害的信息，以社区成员和决策者在东加州剪切带的地震直接风险。