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We estimated near-surface shear-wave velocity (v s ) at the Hwacheon seismic station using a geologic log of a well, microtremors recorded during a period of 56 days, and records of three teleseismic events (M w ≥ 6.0). The v s of the 10-m thick soil layer ( = 296 m/s) was determined from horizontal-to-vertical spectral ratios of microtremors recorded at the surface. The average v s ( = 1,309 m/s) from the surface to the 96-m depth of a borehole sensor, was computed using spectral coherence analyses of data recorded by surfaceand borehole-sensors for the three teleseismic events. Using these calculated values of and , the computed bedrock v s is 2,150 m/s and the time-averaged v s to a 30-m depth is 696 m/s. Accordingly the Hwacheon seismic station is regarded as a relatively good site. The deduced near-surface v s can be used for further quantitative evaluation of site amplification and earthquake hazard.

Near-surface Shear-wave Velocities Derived from Microtremors and Teleseismic Data at the Hwacheon Seismic Station