报告地点：教学行政楼706会议室（线上：腾讯会议630 679 314）
报告时间：2021-10-22 从 14:00 到 16:00
程怡芳（Yifang Cheng）博士，美国加州大学伯克利分校博士后。2014年本科毕业于北京大学地球物理专业， 2016年于俄克拉荷马大学获得硕士学位，2021年于南加州大学获得博士学位，2021年10月开始在加州大学伯克利分校从事博士后研究。主要研究方向包括地震和断层物理机制，地震震源性质，密集台阵观测，机器学习在地球物理问题中的应用等。目前在GRL, JGR 等国际SCI期刊发表论文9篇，其中第一作者6篇。任GRL，JGR，SRL，BSSA等期刊审稿人，主持AGU国际会议相关分会。
报告题目：Volumetric faulting patterns of the 2019 M7.1 Ridgecrest, CA, earthquake sequence
Standard mechanical concepts and models assume that a major rupture is a stick-slip along a single surface. While these simplified models provide important insights to the earthquake and fault mechanics, recent detailed inspections of well-recorded large earthquakes illuminate more complex features. For example, the 2019 Ridgecrest earthquake sequence ruptured two major orthogonal faults and activated a complex fault network with numerous previously unmapped faults. For better clarifying the processes associated with the Ridgecrest sequence using the rich seismic dataset recorded in the region, we systematically analyze the space-time variations of seismicity, potency values, focal mechanisms, and full moment tensors of the earthquakes leading to and during the sequence. The results suggest a long-term increase of shear stress in the 20 years prior to the sequence, the termination of the M6.4 and M7.1 earthquakes near fault zone barriers, the significant damage-related radiations in the early stage of the sequence, and the caused diverse volumetric damage in the surrounding upper and lower crust. The results illuminate large deviations of the real earthquake rupture processes from the simplified models and suggests the importance of monitoring and understanding earthquakes and faults from a volumetric perspective.
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