报告地点：地空楼706 (ZOOM ID：885 1886 1563; Passcode: 32378)
报告时间：2022-03-04 从 15:00 到 17:00
报告人：翁辉辉(Géoazur, Université Côte d'Azur, France)
报告人简介：
翁辉辉博士于2015年取得中国科学技术大学博士学位，2015年-2018年在香港中文大学从事博士后工作，2018年至今在法国UCA和法国国家科学研究中心从事博士后工作，入选国家高层次海外青年人才计划、即将加入南京大学地球科学与工程学院。主要研究方向为震源物理，包括快地震和慢地震动力学破裂过程的理论和数值模拟研究、估算油田诱发地震的可能最大震级、大地震动态破裂过程反演等；未来研究兴趣包括快地震和慢地震的触发机制、大地震的长期破裂规律、地震辐射能规律、断层动力学参数约束等。已在Nature Geoscience, JGR, GRL等国内外刊物发表论文12篇，总引用为336次，h-index为9。
报告题目：Rupture dynamics of fast and slow earthquakes on long faults
报告内容简介
Among the most damaging natural hazards, earthquakes are still today one of the least understood phenomena in Earth Sciences. Earthquakes happen when rocks on either side of a tectonic fault slide. The “rupture speed” describes the spreading speed of the sliding from the hypocenter over the entire fault. The rupture speeds on long faults could be as fast asrockets (e.g., supershear earthquakes), whereas on some other faults they could be as slow as snails (e.g., slow slip events), yet a fundamental model unifying those fast and slow ruptures is still lacking. In the talk, I will present numerical simulations that show that the rupture propagation of both fast and slow earthquakes on long faults can be predicted by a new fundamental three-dimensional theory of dynamic fracture mechanics. The complete spectrum of rupture speeds is quantitatively controlled by the ratio of fracture energy to energy release rate, which depends on the frictional behaviour of the fault. In addition, I will discussthe implications of this new theory on the evaluation of future earthquakesizes, the transition between slow and fast earthquakes, and the debates of the moment-duration scaling relations for slow earthquakes.