【摘要】 在现场实验探测的基础上 ,获得了最佳浅层地震反射探测参数 .数据处理过程中采用了滤波、编辑切除、预测反褶积、初至时拟合静校正和速度分析等技术 ,得到了高质量的浅层地震反射探测剖面 .利用地震剖面中反射波组信息、测线附近多个钻孔的地层和新年代学资料 ,揭示出探测到的断层带上断点位于埋深 75～ 80m ,距今约 2 2万年的中更新世地层中 .从反射波组的连贯性、间断性、数量的增加或减少和形态变化等特点 ,结合钻探地质剖面等资料 ,认识到断层带上断点的宽度为 1 0 0m .从反射波组的数量在剖面中的变化推测 ,隐伏断层陡坎的宽度为 2 0 0m ,它在早更新世和中更新世早期是一条同沉积活动断层 ,中更新世晚期以来没有发生明显错断上覆地层的构造活动 .更多还原

【Abstract】 Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters. In process of data processing, we used the techniques, such as filtering, edition surgical blanking, prediction deconvolution, fitting static correlation of first arrival time, and velocity analysis, and obtained a high-qualitative shallow seismic reflection sounding profile. Comprehensive analysis of the information of reflection wave groups along the seismic sounding profile and the stratigraphic and neogeochronological data obtained from many drills near the sounding line reveals that the upper termination of the detected fault zone is located at depth of 75～80 m, in the Middle Pleistocene deposits dated to be about 220 ka BP. The continuity, discontinuity, increasing and decreasing amount of reflection wave groups and change of their configurations, in combination with geological columns of drills, permitted us to know that the width of upper termination of the fault zone is 100 m. It can be inferred from the variation of number of reflection wave groups along the profile that the scarp of hidden fault is 200 m wide and the fault is a synsedimentary active fault in the Early Pleistocene and the early stage of Middle Pleistocene. No tectonic movement, that offset the covering deposits, had occurred since the late stage of Middle Pleistocene.更多还原