威海七里汤-横山断裂最新活动时代及地震危险性分析

LATEST ACTIVITY TIME AND SEISMIC RISK ANALYSIS OF QILITANG-HENGSHAN FAULT IN WEIHAI CITY

摘要: 通过野外地质调查、室内测年等方法,对七里汤-横山断裂进行详细研究。结果显示:七里汤-横山断裂呈北东向展布,是一条中更新世时代的断裂,晚更新世以来已经不活动。通过计算和结合中国东部中强地震发生的地震地质标志,初步判定该断裂具备发生5.5级左右的地震构造背景。

Abstract: The Qilitang-Hengshan fault is a larger scale fault in the land of Weihai City, Shandong province. By field investigation and dating analysis, we make a comprehensive study of the Qilitang-Hengshan fault.The Qilitang-Hengshan fault is a NE-striking fault, which is predominantly active in the middle Pleistocene and isn't active in the Late Pleistocene.By the study of seismogeologic evidence for moderate earthquakes in East China, we preliminarily conclude that it would not be surprising if an Ms≈5.5 earthquake should occur in the future.