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Seismic site conditions in Gangneung, Korea, based on Rayleigh-wave dispersion curves and topographic data

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Abstract

To determine the near-surface shear wave velocities (Vs) and characterize seismic site conditions in Gangneung, on the east coast of South Korea, passive and active surface waves were recorded at 136 sites. Dispersion images of the Rayleigh waves were obtained by the spatial autocorrelation method and inverted to Vs models. From these one-dimensional Vs models, the depth to the soft bedrock, average Vs at the top of the bedrock, average Vs of the overburden layer, average Vs in the top 30-m interval (Vs 30 ), and average resonance frequency were estimated to be 16 ± 1 m, 481 ± 14 m/s, 254 ± 5 m/s, 374 ± 16 m/s, and 5.5 ± 0.3 Hz, respectively. A lower estimate for Vs 30 and a relatively thick overburden layer make the downtown and agricultural areas in the region more prone to significant ground amplifications. Multiple regression analysis of Vs 30 yielded a correlation coefficient of 0.79 with respect to the variables of elevation and topographic slope. Using this proxy-based empirical relationship, Vs 30 values were computed at 13,583 sites covering the entire city. A microzonation map, constructed based on the Vs 30 data, indicates that the ground in Gangneung is categorized mainly into B (44%), C (39%), and D (15%) National Earthquake Hazards Reduction Program site classes, with minor constituents assigned to the A and E classes.

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  1. Department of Geophysics, College of Natural Sciences, Kangwon National University, Chuncheon, 24341, Republic of Korea

    Abid Ali & Ki Young Kim

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  1. Abid Ali
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Correspondence to Ki Young Kim.

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Ali, A., Kim, K.Y. Seismic site conditions in Gangneung, Korea, based on Rayleigh-wave dispersion curves and topographic data. Geosci J 20, 781–791 (2016). https://doi.org/10.1007/s12303-016-0013-1

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  • DOI: https://doi.org/10.1007/s12303-016-0013-1

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