报告题目：The finding of the near- and far-fields of seismic dynamic displacements and physically constrained source inversion
报 告 人：徐培亮 教授，日本京都大学
邀 请 人：任晓东 教授
报告时间：2026 年 10 月 9 日 16：00
报告地点：51论坛 227 学术报告厅
报告人简介：
徐培亮，日本京都大学教授，1989年获51论坛 （原武汉测绘科技大学）大地测量学博士学位，是我国自己培养的第一位大地测量学博士。曾任国际大地测量学会（IAG）理论大地测量委员会主席(2003-2007)，国际大地测量与地球物理联合会数学地球物理委员会委员（2003-2007)，国际大地测量与地球物理联合会IUGG青年科学家奖评选委员会委员(2021-2023)。现为Journal of Geodesy主编，Sat Nav、Geo-spatial Inform Sci和中国地球物理学报编委。曾获得1999年度国际大地测量学会最优秀论文奖和2002年日本大地测量学会Tsuboi奖，2003年被选为国际大地测量协会会士。主要基础原创学术贡献包括：重建跟踪卫星重力学的数学基础，提出以观测值为基础的微分方程扰动理论，计算式加速度传感器的发明人，发现地震位移的近远场效应及其在地震早期预警高度化的应用，建立以质量度量为基础的TSVD截断准则和反演问题的数据融合，提出符号约束稳健最小二乘法，解决整数最小二乘估计的表示元问题，差分海底精密定位法，系统研究EIV模型的估计和影响，提出GNSS旋转地震学的概念等。
报告摘要：
Although there are a great number of research and publications on empirical amplitude, distance and magnitude scaling laws, none of them have ever considered the near- and far-field effects of displacement functions of seismic waves. We use the GEONET GNSS data collected from the 2011 Tohoku Mw9.0 earthquake to resolve the inconsistency between empirical amplitude, distance and magnitude scaling laws and theoretical displacement functions. We find that the high-rate dynamical GNSS PPP displacements clearly detect the near- and far-field amplitude distance scaling effects during the 2011 Tohoku Mw9.0 earthquake. If the near-field effect of displacements is not correctly taken into account, the decay rate will be significantly underestimated, implying that magnitudes of earthquakes will be significantly underestimated from near-field data with profound negative impact in earthquake early warning and hazard assessment. Advanced EEW will demand to implement this new finding. In the second physically constrained source inversion, we prove that Fredholm integral equations of the first kind for slip inversion are mathematically of a unique solution, theoretically assuring that earthquake rupture can be properly reconstructed if there exist a sufficiently large number of measurements, though slip inversion has been almost always reported to be inherently non-unique. The statement about non-uniqueness of slip inversion can be misleading and misunderstanding, since it is theoretically not true but simply caused by a practical issue of lack of measurements. We propose an inequality-constrained regularized inversion of slip distributions on multiple faults. The method implements a physically more general inequality constraint to accommodate more complex dislocation models and allows reconstructing a complex earthquake mechanism on multiple faults from measurements.
欢迎广大师生前往参加。