Inversion of Rayleigh wave dispersion curves based on the improved sparrow search algorithm
SUN Xu1(), JI Zi-Qi2(), YANG Qing-Yi1, LIU Bo-Zheng1
1. Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250014,China 2. Institute of Geophysics & Geomatics,China University of Geosciences (Wuhan),Wuhan 430074,China
Nonlinear optimization algorithms can be used to conduct a global search for the optimal solutions within a given parameter range, inherently making them highly competent in performing a global search and escaping from local extrema.In this study,an emerging nonlinear optimization algorithm-the sparrow search algorithm (SSA) was introduced for the inversion of Rayleigh wave dispersion curves.To address the problems of multiple parameters and local extrema, adaptive t-distribution was introduced.The data acquired from the inversion experiment of three theoretical models indicate that the improved SSA has high inversion accuracy,stability,and resistance to random noise compared with the conventional SSA.Furthermore,the improved SSA can yield better performance than particle swarm optimization and differential evolution algorithm due to its capability to achieve a more reasonable balance between the early global search and late local search in the process of iteration.
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SUN Xu, JI Zi-Qi, YANG Qing-Yi, LIU Bo-Zheng. Inversion of Rayleigh wave dispersion curves based on the improved sparrow search algorithm. Geophysical and Geochemical Exploration, 2022, 46(5): 1267-1275.
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