美国德州农工大学段本春教授学术报告

地球系统科学论坛第671期：段本春教授学术报告会

应304am永利集团官网王墩教授邀请，美国德州农工大学段本春教授来校交流并做学术报告。

报告时间：2019年6月18日（周二）下午14：30

报告地点：主楼412

报告题目：Earthquake gates & simulators – understanding complex ruptures & ground motion

报告人简介：段本春，1991年毕业于青岛海洋大学（现中国海洋大学），获应用地球物理学士学位，1994年在同校获硕士学位并留校任教。2001年赴美国加州大学河滨分校(University of California, Riverside)攻读博士，于2006年获地质科学博士学位。2006年至2007年在圣地亚哥州立大学(San Diego State University)做博士后研究。2007年获聘德州农工大学（Texas A&M University）地质地球物理系(Department of Geology & Geophysics)助理教授，2013年晋升副教授并获终身教职，2018年晋升正教授。2014与2015曾在日本东京大学以及中国地震局做短期访问研究。早年从事应用地球物理（物探）的野外采集、数据处理与地质解释的教学与科研工作，自2001年起主攻地震震源物理(Earthquake source physics)、地震波传播(Seismic wave propagation)与地质力学(Geomechanics)等研究方向，以有限单元法的数值模拟以及高性能超级计算为主要研究工具。多年来连续获得美国自然科学基金会(NSF)、美国地质调查局(USGS)等机构的多项研究资助，其中包括NSF Early Career Award。在Journal of Geophysical Research, Geophysical Research Letter, Bulletin of Seismological Society, Tectonics 等地学重要期刊发表同行评审的学术论文近50篇。现为美国自然科学基金会项目评审人以及Nature, Journal of Geophysics Research, Earth and Planetary Science Letter 等期刊的审稿人。

报告内容简介：Fault geometrical complexities, such as fault bends, stepovers, and branches, have long been considered as strong barriers to dynamic ruptures, limiting the maximum earthquake size for a given fault system, which is an important parameter in seismic hazard analysis of earthquake-prone regions. Recent large earthquakes, such as the 2016 Mw 7.8 Kaikoura, New Zealand, earthquake, have shown that dynamic ruptures may break through these geometrical complexities, resulting in much larger earthquakes than expected. These geometrical complexities are conceptualized as Earthquake Gates recently, which can open or close, depending on many factors. Dynamic rupture modeling provides a means to understand the underlying physics of earthquake gate behaviors. One critical and poorly-constrained input parameter in dynamic rupture models is the initial stress condition. We extend our dynamic rupture modeling methods to earthquake cycle simulations so that the initial stress condition of dynamic ruptures will be consistent with fault geometry and rupture history. These computer programs are called earthquake simulators. We also apply dynamic earthquake sources to ground motion simulations in 3D geological structure. In this talk, I will overview some recent efforts in the community and present our recent studies on these research topics.

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