汾东断裂甘亭段浅部构造特征

Shallow Structural Characteristics of the Ganting Section of Fendong Fault

利用浅层人工地震勘探技术对临汾盆地汾东断裂进行探测,获得2条高分辨率地震勘探剖面,分析汾东断裂甘亭段浅部地层和断裂基本特征。结果表明,甘亭段浅部地层均呈现西倾形态,整体西厚东薄;汾东断裂甘亭段走向北东,倾向北西,视倾角67°~72°,断层落差26~182m,可辨别的最浅上断点埋深85m,为第四纪活动断裂。对比研究汾东断裂北部甘亭段、南部临汾段剖面特征,认为甘亭段新生代活动强度高于临汾段,汾东断裂活动强度由北向南逐渐降低。

We detect the Fendong fault in Linfen basin using shallow artificial seismic exploration technology,obtain two high-resolution seismic exploration profiles,and analyze the basic characteristics of shallow strata of Ganting section of Fendong fault.The results indicate that the shallow strata of Ganting section shows a west-dipping morphology,with the overall thickness decreasing from west to east.The Ganting section of Fendong fault is characterized by a north-east strike,a north-west dip,a visual dip angle of 67°-72°,and a fault drop of 26-182 meters.The shallowest upper breakpoint that can be identified is buried at a depth of 85 meters,indicating a Quaternary active fault.By comparing the profile characteristics of Ganting section in the north and Linfen section in the south of Fendong fault,we infer that the activity intensity of Ganting section during the Cenozoic is higher than that of Linfen section,and the activity intensity of Fendong fault gradually decreases from north to south.