当前位置:首页>学术报告
Seismic waveform inversion with source manipulation

 
Title:
Seismic waveform inversion with source manipulation
Speaker:
邱凌云 教授,清华大学丘成桐数学科学中心
Inviter: 刘晓东 副研究员
Time & Venue:

2022.8.24 09:00 数学院南楼N620

Abstract:

We present a source-manipulation formulation formitigating the long-standing cycle-skipping issue in the seismicwaveform inversion. We first extend the set of variables in theoptimization problem to include the source wavelet. It turns theminimization problem into a minimax problem. However, thisapproach is not attractive for practical use owing to its unfeasiblecomputation and data collection cost. We propose a method toapproximate the minimax problem with a constrained optimization,which leads to a so-called source manipulation approach. It enhancesthe convexity of the objective function while improving the gradient'squality in the iterative reconstruction. Neural networks are employedto provide an efficient solution to the induced sub-problem.

Affiliation:  

学术报告中国科学院数学与系统科学研究院应用数学研究所
地址 北京市海淀区中关村东路55号 思源楼6-7层 南楼5-6、8层 100190
@2000-2022 京ICP备05058656号-1