报告地点：Zoom(ID:724-620-904)
报告时间：2020-07-24 从 15:00 到 16:30
报告人：王新
报告人简介：
王新，2011年本科毕业于吉林大学，2017年博士毕业于中科院地质与地球物理研究所。2017年至今，先后在新加坡地球观测中心和加州理工学院进行博士后研究。2019年获中国科学院青年百人计划资助。研究方向主要包括壳幔、俯冲板片精细结构研究；中小地震震源参数及断层结构研究；光纤地震仪在工程、地震领域中的应用研究等。目前在EPSL、 JGR 等杂志以第一作者共发表学术论文8篇。
报告题目：Seismotectonics and fault geometries of the 2019 Ridgecrest sequence: insight from earthquake source studies using 3D Green’s functions
报告内容简介
The 2019 Mw 6.4 and Mw 7.1 Ridgecrest earthquakes are the latest major crustal earthquakes in southern California. Geological surveys and satellite observations provide important constraints on the surface ruptures of faulting. However, the subsurface fault geometries, which are important for understanding earthquake initiation, propagation, and termination are not well resolved. In this study, we conduct multi-scale earthquake source studies (from aftershock point source moment tensor inversion to mainshock multi-fault finite fault inversion) using a 3D velocity model. The major findings are (1) Pre-/post-mainshock stress rotations, while different sense and magnitude of stress rotations observed along different segments. This can be largely explained by the varying trends of the fault segments in relation to the regional stress field; joint analysis of different segments suggests that the ratio of mainshock stress drop to the background stress to be 0.5-0.9, indicating a large fraction of the initial stress has been released co-seismically; (2) Complex flower structures, splay, and antithetic faults at shallow depth, while a simple large through-going fault exists at >5 km depth. We suggest that the complex fault geometries partially controlled the rupture patterns of the 2019 Ridgecrest sequence.
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