Towards Full Waveform Ambient Noise Inversion
Towards Full Waveform Ambient Noise Inversion
复制标题
走向全波形环境噪声反演
DOI：
10.3997/2214-4609.201701263
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发表时间：
2017
影响因子：
2.8
通讯作者：
A. Fichtner
中科院分区：
文献类型：
--
作者：
K. Sager;L. Ermert;C. Boehm;A. Fichtner
我们发展了一种噪声相关函数的联合反演方法，用于噪声源分布和地球结构的联合反演。
正演问题不需要将噪声相关性等同于格林函数所需的假设，并且允许我们计算任意分布的噪声源在空间和时间上的站间相关性。利用伴随技术，我们设计了一种基于波形和能量差作为失配泛函的噪声源和大地结构的迭代反演方案。从波动方程走时反演的初始模型出发，高精度地恢复目标速度模型。一个关键的前提是很好地推断噪声源的分布。
We develop a method for the joint inversion of noise correlation functions for the distribution of noise sources and for Earth structure.
The forward problem is free of assumptions required to equate noise correlations with Green functions and allows us to compute inter-station correlations for arbitrary distributions of noise sources in space and time. Using adjoint techniques, we design an iterative inversion scheme for noise sources and Earth structure based on waveform and energy differences as misfit functional. Starting from an initial model from a wave equation traveltime inversion, we recover the target velocity model with high accuracy. A key prerequisite is a good inference of the noise source distribution.