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首页> 外文期刊>Geosciences >Geological and Structural Control on Localized Ground Effects within the Heunghae Basin during the Pohang Earthquake (M W 5.4, 15th November 2017), South Korea
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Geological and Structural Control on Localized Ground Effects within the Heunghae Basin during the Pohang Earthquake (M W 5.4, 15th November 2017), South Korea

机译：浦项地震期间兴海盆地内局部地面效应的地质和结构控制（M W 5.4，2017年11月15日），韩国

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On 15th November 2017, the Pohang earthquake (M w 5.4) had strong ground shaking that caused severe liquefaction and lateral spreading across the Heunghae Basin, around Pohang city, South Korea. Such liquefaction is a rare phenomenon during small or moderate earthquakes (M W 5.5). There are only a few examples around the globe, but more so in the Korean Peninsula. In this paper, we present the results of a systematic survey of the secondary ground effects—i.e., soil liquefaction and ground cracks—developed during the earthquake. Most of the liquefaction sites are clustered near the epicenter and close to the Heunghae fault. Based on the geology, tectonic setting, distribution, and clustering of the sand boils along the southern part of the Heunghae Basin, we propose a geological model, suggesting that the Heunghae fault may have acted as a barrier to the propagation of seismic waves. Other factors like the mountain basin effect and/or amplification of seismic waves by a blind thrust fault could play an important role. Liquefaction phenomenon associated with the 2017 Pohang earthquake emphasizes that there is an urgent need of liquefaction potential mapping for the Pohang city and other areas with a similar geological setting. In areas underlain by extensive unconsolidated basin fill sediments—where the records of past earthquakes are exiguous or indistinct and there is poor implementation of building codes—future earthquakes of similar or larger magnitude as the Pohang earthquake are likely to occur again. Therefore, this represents a hazard that may cause significant societal and economic threats in the future.
机译：2017年11月15日，浦项地震（M w 5.4）发生强烈地面震动，在韩国浦项市附近的兴海盆地引起严重的液化和横向扩展。在中小地震（MW <5.5）期间，这种液化是罕见的现象。全球只有少数例子，而朝鲜半岛则更多。在本文中，我们介绍了对地震期间产生的次要地面效应（即土壤液化和地面裂缝）进行系统调查的结果。大部分液化点聚集在震中附近和兴海断裂附近。根据兴海盆地南部的砂bo的地质，构造背景，分布和聚集，我们提出了一个地质模型，表明兴海断裂可能已成为地震波传播的障碍。其他因素，如山盆效应和/或盲冲断层放大地震波，可能起重要作用。与2017年浦项地震有关的液化现象强调指出，迫切需要对浦项市和其他具有相似地质背景的地区进行液化势测图。在大量未固结的盆地填充物所覆盖的地区（过去的地震记录不明显或不清晰，并且建筑规范的执行不力），将来可能再次发生与浦项地震类似或更大的地震。因此，这代表着一种危害，将来可能会引起重大的社会和经济威胁。

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