Comparative analyses of seismic site conditions and microzonation of the major cities in Gangwon Province, Korea
Abid Ali 1 Ki Young Kim 1 2
+ Author Affiliations
- Author Affiliations
1 Department of Geophysics, College of Natural Sciences, Kangwon National University, Chuncheon 24341, Korea.
2 Corresponding author. Email: kykim@kangwon.ac.kr
Exploration Geophysics 49(2) 176-186 https://doi.org/10.1071/EG16136
Submitted: 8 November 2016 Accepted: 14 November 2016 Published: 9 December 2016
Abstract
To determine the seismic site conditions and microzonation of Chuncheon, Wonju and Gangneung cities in the Gangwon Province, Korea, the dispersion curves of Rayleigh waves were derived at 313 sites by the extended spatial autocorrelation (ESPAC) method. Using the shear-wave velocities (Vs) determined from dispersion curves, average depth to the bedrock (Db) and Vs at the top of the bedrock (Vsb), the overburden layer (Vso) and the top 30 m depth layer (Vs30) were determined. The resonance frequencies (fr) were then computed using both Db and Vso. The estimated averages of the three cities were 13 ± 7 m for Db, 472 ± 109 m/s for Vsb, 248 ± 44 m/s for Vso, 411 ± 157 m/s for Vs30 and 5.8 ± 2.8 Hz for fr. Microzonation maps based on the proxy-based Vs30 indicated that the three cities were mainly categorised into National Earthquake Hazards Reduction Program (NEHRP) classes B, C and D, with a minor proportion of A. Although no area was estimated to be in class E using the proxy-based Vs30, the Vs30 values derived from the recorded Rayleigh waves at 13 sites in Gangneung were less than 180 m/s. This indicates a greater vulnerability to seismic amplification during large earthquakes in this city, which had the smallest Vso, Vs30 and fr, and the greatest Db of the three cities. Microzonation maps, together with information for fr, can be effectively used for seismic risk assessments, urban planning, and disaster management.
Key words: microzonation, Rayleigh wave, seismic amplification, seismic site condition, Vs30.
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