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《Chinese Journal of Geophysics》 1999-03
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INVERSION OF SHEAR-WAVE VELOCITY STRUCTURE IN SHALLOW SOIL FROM RAYLEIGH WAVES

HU JIA-FU;DUAN YONG-KANG;HU YI-LI;FHU-WU;WEN YI-BO; WU XIAO-PING(Earth science Department of Yunnan University, Kunming 650091, China)YANG RUN-HAI;XU ZHAO-YONG(Seismological Bureau of Yunnan Province, Kunming 650041, China)  
Based on the relation betWeen shear-ave velocity of meditun and phase-velocityo f Rayleigh wave in homogenous half-space, the media at all layers in depthsaffected by surfaCe wave with a certain frequency are homogenized, making it aequivalent homogenous half-space. On the precise of homogenization, a model isused to be forward solution in order to determine the relation between explorationdepth and wave length of surface wave. A phase-matChed filtering tecboque isaPPlied to isolate fundamental Rayleigh wave from observed signals. Frommulti-filtering and superposition processes, the dispersions of fundamental s~ewave and group velocity in 5.0-30.0Hz are precisely calculated. Using homogenizedtechique, a primary inversion model is obtained from dispersion curves of phasevelocity. The shear-wave velocity structures at all soil layers above 35m are obtainedby inversions of dispersions of group velocity. The restilts show that the inversionsare better coincident with data of drills.
【Fund】: 云南省自然科学基金!98D019M
【CateGory Index】: P315.31
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