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Data from: A national VS30 model for South Korea to combine nationwide dense borehole measurements with ambient seismic noise analysis

Citation

Kim, Byeongwoo; Hong, Tae-Kyung (2021), Data from: A national VS30 model for South Korea to combine nationwide dense borehole measurements with ambient seismic noise analysis, Dryad, Dataset, https://doi.org/10.5061/dryad.05qfttf44

Abstract

The average shear-wave velocity within the top 30 m from the surface, VS30, represents site characteristics including the soil classification and site amplification that are essential information for building codes and seismic design. A novel method to determine a VS30 model based on a composite analysis of borehole standard penetration test numbers (SPT N) and horizontal-to-vertical (H/V) spectral ambient noise ratios is introduced. A national VS30 model for South Korea is determined using the method. The shear-wave velocity structures beneath 20 nationwide broadband seismic stations are determined using the H/V analysis. The SPT N data are collected from 175,619 nationwide densely-distributed boreholes. The shear-wave velocity models from SPT N values are calibrated for the local reference velocity models from H/V analysis. A representative relationship between the SPT N values and shear-wave velocities is introduced. A national VS30 model for South Korea is determined using the calibrated SPT N models at the nationwide boreholes. The VS30 model is verified by comparisons with local field measurements. The proposed model is consistent with the USGS model based on a surface slope analysis. The VS30 structure presents high correlation with geological and topographic features. The VS30 values are low in coastal (low topographic) areas, and high in mountain (high topographic) areas. Apparent linear relationship is observed between VS30 and topography. The western and southeastern coastal regions may be vulnerable to strong seismic shaking.

Usage Notes

This data set is concerned with the paper "A national VS30 model for South Korea to combine nationwide dense borehole measurements with ambient seismic noise analysis" submitted to Earth and Space Science by Byeongwoo Kim and Tae-Kyung Hong in 2021. We provide data files to produce seven figures in the paper: Figures 3, 8, 9, 11, 14, 17, and 21. All data files are given in the ASCII format.

Please see the detailed information in the file "README.md" included in the zip file.