The Improved Simulated Annealing Algorithm and Application in the Surface Wave Dispersion Inversion

作者：ZHANG Xuemei,YANG Zhigao,SHI Haixia,DU Guangbao,YANG Wen,WEI Xing,HAN Yanyan,LI Fei,HUANG Zhibin,LIU Jie

摘要：The velocity distribution of layers from surface wave dispersion curve is a severely nonlinear program. Base on the Metropolis rule,we improved the simulated annealing algorithm to simultaneously inverse the velocities and thicknesses using the dispersion data and identified the Moho and the bottom of lithosphere. The application to the numerical examples with 5% noise shows the velocity RMS is 1. 56% between the non-linear results and the original models when the condition of selecting method for temperature parameters and initial temperature are satisfied. Using the pure dispersions of Rayleigh wave,the nonlinear inversion has been carried out for S-wave velocities and thicknesses of the vertical profile crossing the Indian Plate,the Qinghai-Tibetan Plateau,and the Tarim Basin. It indicated that the crustal thickness is about 70 km in the Qiangtang block,while in the hinterland of the Qinghai-Tibetan Plateau the lithosphere is relatively thin(~ 130 km)from the velocity values and their offsets.

發文機構：China Earthquake Networks Center Institute of Geophysics

關鍵詞：SIMULATEDANNEALINGalgorithmSIMULTANEOUSINVERSIONDISPERSIONCURVEReconstructionofvelocitymodel

分類號： P31[天文地球—固體地球物理學][天文地球—地球物理學]