A pilot project of ambient noise tomography on a dense seismic array in Ji'nan urban area  

作　　者：Feng Liang Lei Gao Zhihui Wang Tao Wang Kai Liu 

机构地区：[1]Sinoprobe Center-China Deep Exploration Center,Chinese Academy of Geological Sciences

出　　处：《Earthquake Science》2018年第5期262-271,共10页地震学报（英文版）

基　　金：supported by China Geological Survey's project(Nos.and DD20189132);Basic Scientific Research project from Chinese Academy of Geological Sciences(No.YWF201901-02);The National Key Research and Development Program of China(Nos.2016YFC0600201,2016YFC0600208 and 2016YFC0600209)

摘　　要：In this study, we conducted ambient noise tomography(ANT), with 33-day data, to investigate the nearsurface shear-velocity structure in downtown Ji’nan, Shandong Province, China. The cross-correlation functions with quiet clear Rayleigh waves are obtained with more symmetrical energy distribution which indicates that strong human activities, such as moving vehicles and municipal engineering construction, can produce approximately isotropic distribution of noise sources for high-frequency signals. The direct surfacewave tomographic method with period-dependent ray-tracing is used to invert all surface-wave dispersion data in the period band 0.2–1.5 s simultaneously for 3D variations of shear-velocity structure. The study result can help us better understand the local geologic structures, evaluate the distribution and geometry of the fracture-karst media, and assess hazards of the concealed active fault and its effect on the springs in the future.In this study, we conducted ambient noise tomography(ANT), with 33-day data, to investigate the nearsurface shear-velocity structure in downtown Ji'nan, Shandong Province, China. The cross-correlation functions with quiet clear Rayleigh waves are obtained with more symmetrical energy distribution which indicates that strong human activities, such as moving vehicles and municipal engineering construction, can produce approximately isotropic distribution of noise sources for high-frequency signals. The direct surfacewave tomographic method with period-dependent ray-tracing is used to invert all surface-wave dispersion data in the period band 0.2–1.5 s simultaneously for 3D variations of shear-velocity structure. The study result can help us better understand the local geologic structures, evaluate the distribution and geometry of the fracture-karst media, and assess hazards of the concealed active fault and its effect on the springs in the future.

关 键 词：ambient noise shear wave velocity urban geophysics urban underground space dense array 

分 类 号：P631.4[天文地球—地质矿产勘探]