Journal
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
Volume 19, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2022.3152198
Keywords
Decoupled elastic wave equation; elastic full-waveform inversion (EFWI); high-wavenumber component; unconverted-wave equation
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Funding
- National Natural Science Foundation of China [42030103]
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Elastic full-waveform inversion (EFWI) is a method for recovering high-resolution model parameters, but the coupling of P- and S-waves introduces nonlinearity and parameter crosstalk in EFWI. We propose an EFWI approach with unconverted-wave adjoint propagators to address these issues and achieve satisfactory results.
Elastic full-waveform inversion (EFWI) can restore high-resolution model parameters by minimizing the misfit function between the modeled and observed data. However, the coupling propagation of P- and S-waves will cause the crosstalk among elastic parameters and increase the nonlinearity of EFWI. The decoupled elastic wave equation can help EFWI to weaken the crosstalk effect, hut it increases the computational cost of EFWI. In addition, the decomposition of the S-wave stress will produce artifacts. Hence, we have developed an EFWI approach with unconverted-wave adjoint propagators to recover the high-resolution model parameters. In the new EFWI, we use the unconverted-wave equation to construct the adjoint propagators without S-wave stress decomposition, which can reduce the artifacts. Since the unconverted-wave equation omits the cross term in the elastic wave equation, the computational cost of EFWI is reduced. Numerical examples have demonstrated that our EFWI can efficiently produce high-resolution models and reduce the computational cost of EFWI by about 30%.
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