Historical seismicity of Korea
Historical seismicity of Korea
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DOI：
10.1785/0120050050
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发表时间：
2006-06-01
影响因子：
3
通讯作者：
Yang, Woo-Sun
中科院分区：
文献类型：
--
作者：
Lee, Kiehwa;Yang, Woo-Sun
朝鲜半岛位于欧亚板块，毗邻地震活跃的中国和日本列岛。1905年，朝鲜开始对地震进行仪器观测，迄今为止，在半岛及其附近地区已经探测到大约1000起地震，其中大多数震级都很小，小于4.0级。与公元2年至1904年发生在半岛的约2186次历史地震相比，这些地震造成的应变释放几乎可以忽略不计。在这项研究中，这些历史地震编目从韩国的历史文件，并尽可能估计其震中和强度。韩国历史地震活动的时间变化清楚地揭示了19世纪非常不规则的应变释放模式，除了从15世纪到18世纪异常高的地震活动外，大部分时间都是低到中等的地震活动。这种高度不规则的应变释放图象清楚地表明了半岛板内地震活动的特征。大地震的震中似乎与半岛的主要断层和主要地质单元的边界有很好的联系。应当指出，与历史上大地震有关的主要断层是由严重破坏半岛地壳层的中生代构造活动造成的。历史上半岛各地都发生过地震;然而，东北部的地震相对较少，可能是由于该地区在中生代受到的破坏较少。从历史上的朝鲜地震确定的震级-频率关系中的B值为0.71，这是在日本群岛和中国东部之间，低于许多稳定的板内地区。
The Korean peninsula lies in the Eurasian plate, neighboring seismically active China and the Japanese Islands. Instrumental observation of earthquakes began in Korea in 1905, and about one thousand events of mostly small magnitude, less than 4.0, have been detected to date in and near the peninsula. Strain release due to these earthquakes is almost negligible compared to that due to about 2186 historical earthquakes that occurred from 2 to 1904 A.D. in the peninsula. In this study, these historical earthquakes are cataloged from Korean historical documents, and their epicenters and intensities are estimated as best as possible. Temporal variations of the historical seismicity of Korea clearly reveal a very irregular strain release pattern over the nineteen centuries, with low to moderate seismicity most of the time except for the unusually high seismicity from the fifteenth to the eighteenth centuries. This highly irregular strain release pattern clearly indicates the characteristics of intraplate seismicity of the peninsula. Epicenters of large earthquakes appear to be well associated with the major faults and the boundaries of major geological units in the peninsula. It is to be noted that the major faults associated with large historical earthquakes were created by the Mesozoic tectonic activities that severely disrupted crustal layers of the peninsula. Historical earthquakes occurred all over the peninsula; however, the northeastern part appears relatively less seismic, probably due to the area being less disrupted during the Mesozoic. The b value in the magnitude-frequency relation determined from historical Korean earthquakes is 0.71, which is between those of the Japanese Islands and Eastern China and is lower than in many stable intraplate regions.