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| | Abstract | | We conducted new linear array Passive seismic method using walking noises to evaluate shear wave velocity structure at a model levee for about one month, and 20 S-wave velocity profiles were reconstructed. This new method can obtain Rayleigh wave dispersion curve in wide range of frequency band. As a result, phase velocity decreased in frequency of higher than 40 Hz after rain. This means that S-wave velocity decreased by rainwater infiltration in the surface layer, and S-wave velocity of unsaturated soil depends on volumetric water content. In conclusion, Passive seismic method using walking noises was helpful to evaluate change of shear wave velocity in the surface layer, and monitoring of S-wave structure was effective to clarify weak part by water infiltration and important to assess the stability of embankment during rain. |
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