甘肃省天水市活动断裂带主要特征及活动性分析

Characteristics and Activity Analysis of Main Active Faults in Tianshui City, North Margin of Western Qinling Mountains

通过地面地质调查、深部地球物理探测和高精度遥感影像解译相结合的手段,对天水市活动断裂带开展了综合地质调查和研究,基本查明了该区活动断裂的空间分布、出露情况、错断规模及断裂特征。活动断裂主要有北西西、北西和北东向3组,其控制了天水市新生代以来地质地貌格局。其中,北西西向断裂是天水城市规划范围主要活动断裂,沿断裂走向延伸大、断裂破碎带出露宽,活动性强-极强;北西向断裂中等;北东向断裂活动性较弱。该研究对提高天水市城市活动断裂研究、国土空间规划及防灾减灾等有重要意义。

Based on the comprehensive geological survey and research of the active fault zone in Tianshui city by means of combining the ground geological survey, deep geophysical exploration and high precision remote sensing image interpretation, the distribution, exposure, scale and fault characteristics of the active fault zone in this area are basically identified. There are three groups of, NWW, NW and NE active faults, which control the geological and geomorphological pattern of Tianshui city since Cenozoic. The NWW fault is the main active fault in Tianshui city, with large extension along the fault strike, wide exposed fracture zone, and strong to strong activity. The NW fault is medium, and the NE fault is weak. This study is of great significance for improving the research degree of active faults, land space planning and disaster prevention and mitigation of Tianshui city.