Inversion of S-wave velocity structure near the surface by spatial autocorrelation technique of microtremors
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Abstract
In the field of near surface geophysics, the inversion for the velocity structure based on the dispersion of surface waves extracted by spatial auto-correlation (SPAC) of microtremors is a simple and reliable geotechnique scheme. This paper deals with the ambient seismic noise recorded by a circular array, and introduces a simple method to extract the dispersion curve of surface wave by processing the SPAC coefficients properly. The reliable dispersion curves in the frequency range of 6.7—23 Hz are extracted. The S-wave velocity structure is obtained by fitting the observed dispersion curves with predicted ones. The structure by inversion agrees well with that obtained by drilling test under the array.
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