A new method for Rayleigh wave inversion by geological unit merging

Shu Wang, Dengke He, V. Yepes, L. Wang, W. Qin
2020 E3S Web of Conferences  
Rayleigh wave exploration is widely used in engineering investigation due to the advantages of speediness, small attenuation, and strong anti-interference ability. However, it is difficult to get accurate results since the Rayleigh wave inversion is a multi-parameter and high nonlinear problem. During the inversion, the strata over the target layer must be divided into many thin layers. The more thin layers are divided, the more parameters are needed to invert. Usually, the number of parameters
more » ... umber of parameters is much larger than the actual data points, which makes the inversion an under-determined equation. Actually, the several adjacent thin layers will be the parts of a same geological unit. The paper therefore proposed a new method for Rayleigh wave inverting based on geological unit merging into a super unit. Simultaneously, the Bayesian estimation was introduced to determine if the adjacent thin layers could be merged into larger ones. The synthetic model testing demonstrated that the new method is feasible and can effectively improve the accuracy of the inversion.
doi:10.1051/e3sconf/202016503008 fatcat:xjubnhdrg5f25gganonlwggmqu