3-D time-domain Gauss–Newton full waveform inversion for near-surface site characterization
3-D time-domain Gauss–Newton full waveform inversion for near-surface site characterization
复制标题
用于近地表站点表征的 3D 时域高斯牛顿全波形反演
DOI：
10.1093/gji/ggz020
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发表时间：
2019
影响因子：
2.8
通讯作者：
Horhota, David
中科院分区：
文献类型：
--
作者：
Tran, Khiem T;Mirzanejad, Majid;McVay, Michael;Horhota, David
提出了一种新的三维时间域高斯-牛顿全波形反演方法(3-D FWI)，用于近地表场点的表征。该方法基于三维弹性波动方程的求解，用于波传播的正演模拟，并基于高斯-牛顿反演法进行模型修正，以提取材料属性。正演模拟和模型更新都是在时间域中进行的，这允许同时利用多个频率的完整波形信息来获得详细的地下材料属性。基于虚拟震源和倒易波场，提出了一种同时计算所有单元的导数地震记录(雅可比矩阵)的有效方法。在合成数据集和野外实验数据集上测试了该方法的性能。利用位于地表均匀二维网格中的传感器和震源获取地震波场，然后对波场进行反演以提取三维地下波速结构。结果表明，波形分析能较好地区分试验场的低速合成层和高速合成层，以及不同土层/岩层。野外实验得到的波速(Vs)剖面与侵入性标准贯入试验(SPT)N值基本吻合，包括低速区的识别。交叉伴随三维FWI得到的Vs剖面也用于对比，而高斯-牛顿反演法的结果与SPTN值在趋势和震级上都更加一致。
We present a new 3-D time-domain Gauss–Newton full waveform inversion (3-D FWI) method for near-surface site characterization. The method is based on a solution of 3-D elastic wave equations for forward modelling of wave propagation, and Gauss–Newton inversion approach for model updating to extract material property. Both the forward modelling and model updating are conducted in the time domain, which allows exploiting complete waveform information of multiple frequencies simultaneously for detailed subsurface material properties. Based on virtual sources and reciprocal wavefields, an efficient approach is developed to calculate derivative seismograms (Jacobian matrix) for all cells simultaneously. The capability of the presented FWI method is tested on both synthetic and field experimental data sets. Sensors and sources located in uniform 2-D grids on the ground surface are used to acquire seismic wavefields, which are then inverted for extraction of 3-D subsurface wave velocity structures. The results show that the waveform analysis was able to characterize low- and high-velocity synthetic layers, and variable soil/rock layers of the test site. TheS-wave velocity (Vs) profiles from field experiment generally agree with invasive standard penetration test (SPT)N-values, including identification of a low-velocity zone.Vsprofiles obtained from a cross-adjoint 3-D FWI are also included for comparison, and results from the presented Gauss–Newton inversion are more consistent with the SPTN-values in both trend and magnitudes.
影响因子：
3.3
作者：
W. Pan;K. Innanen;G. Margrave;D. Cao
通讯作者：
W. Pan;K. Innanen;G. Margrave;D. Cao
全波形断层扫描解析沙漠冲积层
影响因子：
4
作者：
K. Tran;B. Luke
通讯作者：
B. Luke
影响因子：
3.3
作者：
Warner, Michael;Ratcliffe, Andrew;Bertrand, Alexandre
通讯作者：
Bertrand, Alexandre