辽宁鞍山市主要断裂的探测与研究

A Study and Exploration on the Main Faults in Anshan City,Liaoning Province

为了给鞍山市抗震设防区划提供依据 ,我们采用了以浅层人工地震为主的综合地球物理探测技术 ,包括浅层人工地震、电法和地质雷达等方法 ,同时收集了城市已有的物探和钻井资料 ,并结合野外调查及样品年龄测试对断裂的活动性进行了研究。结果表明 ,鞍山市存在 5条隐伏或半隐伏的断裂 ,北西向的大石头 -宋三台断裂、宁远屯断裂、大阳气断裂和北东向的汤岗子断裂为中更新世断裂 ,北西向的二台子断裂为早更新世或前第四纪断裂 ,按活断层定义 ,上述断裂均不是活动断裂。文章还就鞍山市在 1975年海城 7 3级地震中严重破坏区的形成原因作了讨论。

The 5 hidden faults in Anshan city,Liaoning Province were explorated by synthetic geophysical methods,the age of which were determined by datings and field investigation.The research results show that the above mentioned faults had moved in early\|middle Pleistocene,which are not the active fault in the light of the definition on active faults. The problem concerning the occurrence of high intension belt caused by 1975 Haicheng earthquake with M \-S 7 3 is discussed in this paper.