Imaging the Graben Structure Based on Microtremor with H/V Spectral Ratio

The long period spectrum characteristics of microtremor have been used in investigating dynamic parameters and speculating the graben structure. This paper reports the results from a microtremor observation profile crossing the Xuzhou City to deduce the graben structure of the Xuzhou Basin, and investigate the predominated period in the H/V spectral ratio method. When the equivalent shear wave velocity is constant, the result shows good corresponding relationship between predominant period and sedimentary thickness. The theoretical calculation of the microtremor characteristics based on wave propagation theory validates the analysis results from the observation. The method, imaging the graben structure based on microtremor with H/V spectral ratio is credible, and the predominant period obtained from H/V spectral ratio is more precise than horizontal power spectrum.