报告地点:教学行政楼706会议室 腾讯会议:429-643-820
报告时间:2023-11-10 从16:00到17:00
报告人:裘鸿瑞(中国地质大学(武汉))
报告人简介:
裘鸿瑞,2013年本科毕业于中国科学技术大学,并获得了郭沫若奖学金,2019年获南加州大学理学博士学位。2019-2023年分别于莱斯大学、麻省理工学院和美国劳伦斯伯克利国家实验室任博士后职位。2022年获得国家自然科学基金优秀青年科学基金项目(海外)的资助,并于2023年9月入职中国地质大学(武汉)。主要从事基于密集台阵技术对断裂带进行多尺度成像和监测、机器学习在速度模型反演和评估中的应用、以及与地热和碳封存相关的地震危险性检测和评估等研究。迄今已在GRL、JGR-Solid Earth、GJI、SRL、PNAS等期刊发表SCI文章20余篇,是JGR、GRL、GJI、SRL、Geophysics、IEEE等杂志的审稿人,并于2021和2022年两次获得JGR-Solid Earth优秀审稿人。
报告题目:基于密集台阵对南加州地区Garlock断裂带的精细成像
报告内容简介
We provide high-resolution seismic imaging of the central Garlock fault using data recorded by two dense seismic arrays that cross the Ridgecrest rupture zone (B4) and the Garlock fault (A5). Analyses of fault zone head waves and P-wave delay times at array A5 show that the Garlock fault is a sharp bimaterial interface with P waves traveling ∼5% faster in the northern crustal block. The across-fault velocity contrast agrees with regional tomography models and generates clear P-wave reflections in waveforms recorded by array B4. Kirchhoff migration of the reflected waves indicates a near-vertical fault between 2 and 6 km depth. The P-wave delay times imply a ∼300-m-wide transition zone near the Garlock fault surface trace beneath array A5, offset to the side with faster velocities. The results provide important constraints for derivations of earthquake properties, simulations of ruptures and ground motion, and future imaging studies associated with the Garlock fault.