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| | Abstract | | We analyzed seismic refraction data obtained at mountainous area in terms of the analyses of surface wave methods and microtremor array measurements and estimated an S-wave velocity profile. Forty-six stand-alone seismographs and 2 Hz vertical component of geophones with spacing of 50 m were used in data acquisition. Seismic data were continuously recorded with a sampling time of 1 ms. We exploded 100 ~ 3000 g of water gel explosive at 14 locations with depths of 0.6 ~ 20 m. Clear later waves corresponding to surface waves appeared in all shot records and dispersion curves with a phase velocity of approximately 2500 m/s were recognized in a frequency range between 2 ~ 10 Hz. Spatial auto-correlation analysis was applied to ambient noise and a dispersion curve with a phase velocity from 2500 ~ 4000 m/s was recognized in a frequency range between 0.4 ~ 4 Hz. Dispersion curves obtained from the shot records and the ambient noise agreed with each other in a frequency range between 2 ~ 4 Hz. Non-linear inversion was applied to the dispersion curves and an S-wave velocity profile to a depth more than 1 km was estimated. |
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