报告摘要：

In this work, we generalize the envelope operator and introduce multi-scale envelope decomposition and extend the envelope data into multi-scale window-averaged envelope (WAE). We also derive a new direct envelope Fréchet derivative (sensitivity operator) based on energy-pulse scattering physics without using the chain rule of differentiation. This new envelope Fréchet derivative (EFD) does not have the weak nonlinearity assumption and can be applied to the case of strong-nonlinear inversion involving salt structures.

报告人简历：

Ru-Shan Wu教授博士毕业于美国麻省理工学院（MIT），现为加州大学圣克鲁兹分校（University of California, Santa Cruz）教授，模拟与成像实验室（Modeling and Imaging Laboratory）主任，欧洲科学院通讯院士。迄今发表4部专著，SCI论文100余篇。主要研究领域为地震波散射与衰减，地震波场层析成像与反演，非均匀介质地震波理论，地震波场照明分析等。

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2017年10月23日