Joint inversion of Rayleigh wave phase velocity by GA and Levenberg-Marquardt(LM)algorithm
遗传算法和LM算法联合反演瑞雷波相速度

The methods of prospecting the underground structure based on the measurement of phase velocity dispersion of surface wave and its inversion,such as the microtremor survey method,have been widely used in the study of earth's crust prospecting and engineering geological prospecting since the middle period of last century.This paper is aimed at improving the precision of inversion in these methods.Based on the analysis of problems emerging in the applying GA to the inversion of surface wave dispersion,we adopted the combination of genetic algorithm and LM algorithm to the inversion of dispersion curves.Using variable global results obtained by the inversion depended on GA as initial parameter,we again carry out additional local search based on the LM algorithm,and approach to the optimal solution.This technique could overcome their weak points and accomplish the inversion of high accuracy.