报告地点：教学行政楼706 （线上：腾讯会议 921 163 864）
报告时间：2022-02-25 从 15:00 到 17:00
报告人：李多
报告人简介：
李多博士于2011和2013年取得北京大学固体地球物理专业学士和硕士学位。2013-2018年在加拿大麦吉尔大学（McGill）攻读博士学位。2018年博士毕业至今在德国慕尼黑大学地球与环境科学系从事博士后研究，主要研究方向为震源物理，包括俯冲带慢滑移事件和大地震数值模拟、地震有限断层带模型、地震非弹性形变以及其对地震破裂的影响等。已在JGR, GRL, EPSL等国内外地球物理学刊物发表文章12篇。
报告题目：Data-integrated megathrust earthquake rupture simulations
报告内容简介
Extreme-scale earthquakes of (M8+) are catastrophic: intense ground shakings are generated by rapid energy release - equal to tens of nuclear explorations - in tens of seconds and sometimes followed by secondary hazards such as landslides and disaster tsunami waves. We still have limited knowledge of the energy buildup and release through nucleation, propagation and post-seismic relaxation of rapid earthquake rupture. Here we combine advanced numerical modelling techniques, experimental measurements, seismic and aseismic observations, to unravel the influence of transient stress and strength on megathurst earthquake nucleation and various fault weakening mechanisms in earthquake source physics. We firstly present two-step linked numerical simulations of long-term quasi-dynamic slow slip cycles model and dynamic rupture and seismic wave propagation across the same complex 3D megathrust geometry of the flat-slab segment in the Guerrero Seismic Gap, Mexico. We then present dynamic rupture models for the M8.2 Chignik megathrust earthquake considering 3D realistic slab geometry, high-resolution topo-bathymetry, variation of pore fluid pressure along with both dip- and strike-directions, and geodetically inferred fault coupling. Understanding the conditions governing the dynamics of megathrust earthquakes has the potential to advance our understanding of seismic hazards in subduction regions.