Estimation of Shallow S-Wave Velocity Structure of Two Practical Sites from Microtremors Array Observation in Tangshan Area  

作　　者：董连成 陶夏新 李广影 

机构地区：[1]School of Civil Engineering,Harbin Institute of Technology [2]College of Architecture and Civil Engineering,Heilongjiang Institute of Science and Technology

出　　处：《Transactions of Tianjin University》2007年第5期344-348,共5页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(No.50378032and No.50538030);Associated Foundation of Earthquake Science(No.201009);Foundation of Heilongjiang Institute of Science and Technology(No.04-15).

摘　　要：Microtremors array observation for estimating S-wave velocity structure from phase velocities of Rayleigh and Love wave on two practical sites in Tangshan area by a China-US joint group are researched.The phase velocities of Rayleigh wave are estimated from vertical component records and those of Love wave are estimated from three-component records of microtremors array using modified spatial auto-correlation method.Haskell matrix method is used in calculating Rayleigh and Love wave phase velocities,and the shallow S-wave velocity structure of two practical sites are estimated by means of a hybrid approach of Genetic Algorithm and Simplex.The results are compared with the PS logging data of the two sites,showing it is feasible to estimate the shallow S-wave velocity structure of practical site from the observation of microtremor array.Microtremors array observation for estimating S-wave velocity structure from phase velocities of Rayleigh and Love wave on two practical sites in Tangshan area by a China-US joint group are researched. The phase velocities of Rayleigh wave are estimated from vertical component records and those of Love wave are estimated from three-component records of microtremors array using modified spatial auto-correlation method. Haskell matrix method is used in calculating Rayleigh and Love wave phase velocities, and the shallow S-wave velocity structure of two practical sites are estimated by means of a hybrid approach of Genetic Algorithm and Simplex. The results are compared with the PS logging data of the two sites, showing it is feasible to estimate the shallow S-wave velocity structure of practical site from the observation of microtremor array .

关 键 词：microtremors array Love wave and Rayleigh wave phase velocities S-wave velocitystructure hybrid approach of Genetic Algorithm and Simplex 

分 类 号：O352[理学—流体力学]