山西峨嵋台地北缘断裂全新世古地震研究

山西峨嵋台地北缘断裂是汾渭断陷带内临汾-侯马盆地与峨嵋台地隆起之间的边界断裂,对临汾-侯马盆地内的侯马次级盆地具有控制作用。该断裂自西向东分为西、中、东3段,西段为早中更新世活动,中段为全新世活动,东段为晚更新世活动。在断裂中段的任庄村和金沙村附近开挖了两个探槽,通过对探槽所揭露的古地震事件的年代学分析,结合前人研究结果,认为峨嵋台地北缘断裂全新世发生过A1及A2两次古地震事件,年代分别为466a BC、约4.6ka BP。事件A1即史料记载的466a BC晋空桐地震,震级可能达71/2级。

Holocene and Paleo Earthquakes along the Northern Marginal Fault of Emei Platform, Shanxi Province

The northern marginal fault of Emei Platform at the border between the Linfen-Houma Basin and Emei Platform. This fault consists of western, middle and eastern sections based on each segment activity. The last active times of the fault are the early middle Pleistocene in the western section, the Holocene in the middle section, and the late Pleistocene in the eastern section respectively. We excavated two trenches near Renzhuang village and Jinsha village in the middle section, and revealed two paleo earthquake events since the Holocene. The first event occurred in 466a BC and the second occurred in about 4.6 ka BP. The first event is in good agreement with the historical documents of Kongtong earthquake of magnitude 7? which happened in 466a BC in Shanxi province.