由显观构造形迹所反映的茅东断裂运动学特征

THE STUDY ON KINEMATICS CHARACTERISTICS OF THE EASTERN FAULT ZONE OF MAOSHAN

本文基于对茅东断裂带陶家洼—什箦段的断裂面现场显观构造形迹(包括擦动线理构造、磨砾岩和断面上的张裂隙)调查、分类和统计,用以反演不同地质历史时期的断裂运动学特征.其结论认为:茅东断裂在晚更新世以来具有以左旋走滑为主的运动学特征,这与宏观地质现象是吻合的.笔者在文中还就显观构造形迹所反映的地质历史时期地震信息进行粗略的定量讨论,认为茅山东侧断裂地质历史时期的地震活动水平为5—6级,最大不超过7级,这与现今地震活动水平是统一的.

Basis on the data of the megascopi minor-tectonic obtained by field geological investigation in the segment between Taojarwa and Zhuoze along the Eastern fault zone of Maoshan,the authors has inverted kinetic model of the fault zone using above mentioned data,and come to some conclusions are as follows:the left lateral strike-slip mode is demiuant for the active partten of fault zone of Maoshan,and conform to the geological landscape. Finally,the seismicity due to the fault movement in geological time has been discused in semi fixed quantity.The results show that the seismicity levels in this district was limited within scale of a magnitude 5-6,and the maxium was not exceeded 7.