Comparative analyses of seismic site conditions and microzonation of the major cities in Gangwon Province, Korea
Comparative analyses of seismic site conditions and microzonation of the major cities in Gangwon Province, Korea
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韩国江原道主要城市地震场地条件及微分区对比分析
DOI：
10.1071/eg16136
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Ki Young Kim
中科院分区：
文献类型：
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作者：
Abid Ali;Ki Young Kim
为了确定韩国江原道春川、元州和江陵市的地震场地条件和小区划，采用扩展空间自相关（ESPAC）方法在313个场地获得了瑞利波频散曲线。使用从频散曲线确定的剪切波速度（Vs），确定到基岩的平均深度（Db）和基岩顶部的Vs（Vsb）、覆盖层（Vso）和顶部30 m深度层（Vs 30）。然后使用Db和Vso两者计算共振频率（fr）。这三个城市的估计平均值分别为DB 13 ± 7 m、Vsb 472 ± 109 m/s、Vso 248 ± 44 m/s、Vs 30 411 ± 157 m/s和fr 5.8 ± 2.8 Hz。基于代理的Vs 30的小区划图表明，这三个城市主要属于国家地震减灾计划（NEHRP）的B类，C和D，A的比例较小。虽然使用基于代理的Vs 30估计没有区域属于E类，但从江陵13个地点记录的瑞利波得出的Vs 30值小于180 m/s。这表明，在大地震期间，这个城市更容易受到地震放大的影响，它具有最小的Vso，Vs 30和fr，以及三个城市中最大的Db。小区划图与地震反应信息一起可以有效地用于地震风险评估、城市规划和灾害管理。为了确定韩国春川、元州和江陵的地震场地条件和小区划，采用ESPAC方法在313个场地获得剪切波速度。基于代理的Vs 30表明，这些城市主要被分为NEHRP类B、C和D，A类的比例较小。
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. 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 Vs30 indicated that these cities were mainly categorised into NEHRP classes B, C, and D, with a minor proportion of A.