Frequency-domain acoustic full waveform inversion with an embedded boundary method for irregular topography
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- Frequency-domain acoustic full waveform inversion with an embedded boundary method for irregular topography
- Park, Yun Hui; Hwang, Jongha
- KIOST Author(s)
- Park, Yun Hui(박윤희); Hwang, Jongha(황종하)
- 박윤희; 황종하
- In the implementation of full waveform inversion (FWI) to identify subsurface velocity distributions with land seismic data, which are often acquired in regions with irregular topography, wave equation-based modelling requires caution. In particular, when using the finite difference method (FDM), unwanted scattered waves are generated because irregular surfaces crossing a rectangular grid are discretized via a staircase approximation; hence, if the problems caused by this staircase approximation are disregarded, FDM-based FWI may fail due to the presence of undesirable wavefields. To resolve this problem, this study develops a 2D frequency-domain acoustic FWI technique using a 9-point FDM-based modelling scheme that includes an embedded boundary method (EBM). This study suggests a workflow for the whole EBM-based FWI process from the calculation of coefficients for the EBM-based 9-point FDM modelling to applying it to FWI for proper velocity updates. In numerical examples, using velocity models with a tilted surface and an arbitrarily fluctuating surface, we synthesize seismic data and verify the accuracy of EBM-based 9-point FDM modelling and its superiority over the conventional FDM by comparing it with wavefields derived from the spectral element method. Then, we show that our EBM-based FWI is able to estimate subsurface velocity distributions even though the model has irregular topography, which spoils the result of the conventional FWI.
- Exploration Geophysics, v.54, no.3, pp.241 - 252, 2023
- Consultants Bureau
- Embedded boundary method; full waveform inversion; irregular topography; complex surface; Lagrangian interpolation
- Article; Early Access
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