1887
Volume 49, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

To determine the seismic site conditions and microzonation of Chuncheon, Wonju, and Gangneung in Korea, shear-wave velocities were derived at 313 sites by the ESPAC method. The proxy-based indicated that these cities were mainly categorised into NEHRP classes B, C, and D, with a minor proportion of A.

,

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 () determined from dispersion curves, average depth to the bedrock () and at the top of the bedrock (), the overburden layer () and the top 30 m depth layer () were determined. The resonance frequencies () were then computed using both and . The estimated averages of the three cities were 13 ± 7 m for , 472 ± 109 m/s for , 248 ± 44 m/s for , 411 ± 157 m/s for and 5.8 ± 2.8 Hz for . Microzonation maps based on the proxy-based 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 , the 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 , and , and the greatest of the three cities. Microzonation maps, together with information for , can be effectively used for seismic risk assessments, urban planning, and disaster management.

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2018-04-01
2026-01-16

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Comparative analyses of seismic site conditions and microzonation of the major cities in Gangwon Province, Korea
Exploration Geophysics 49, 176 (2018); https://doi.org/10.1071/EG16136
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  • Article Type: Research Article
Keyword(s): microzonation; Rayleigh wave; seismic amplification; seismic site condition; Vs30

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