综合探测方法在太原盆地东山山前断层探测中的应用
The Application of Comprehensive Prospecting Method in The TaiyuanBasin Dongshan Piedmont Fault

东山山前断层位于太原盆地东部，是盆地北端的边界断层。在多道直流电法和浅层地震勘探初步确定断层位置的基础上，采用钻孔联合剖面探测对断层进行准确定位，并结合年代样品测试确定断层的最新活动时代。通过探测得到：东山山前断层是由三条断层组成的断裂带，长22 km，宽约800 m。断层上断点埋深约16.7 m，错断了中更新世地层，最大断距约23.96 m，断层的最新活动时代为中更新世。此结果修正了前人认为其为晚更新世活动断层的结论。三种探测方法中，多道直流电法勘探只能初步确定断层的位置，采用高分辨率浅层地震勘探和钻孔联合剖面相结合的探测方法是确定隐伏断层位置、判定断层活动性的有效方法。
Dongshan piedmont fault of Taiyuan basin in the East, is the north boundary fault in the Taiyuan basin. Previous data indicate that the fault is a late Pleistocene active fault, From Taiyuan city active fault detection and seismic hazard assessment project, the Dongshan piedmont fault detailed exploration, Exploration methods include high density resistivity、shallow seismic exploration and borehole profile exploration. Based on fault location by multi-channel DC resistivity and shallow seismic exploration, using bore associated profile detection of faults accurately positioning, Combined with the sample test to determine the fault era. Multi channel DC exploration confirms the presence of Dongshan piedmont fault and the approximate position, Shallow seismic exploration and bore associated profile determine exact location and upper buried depth of the fault. The latest active age of fault was obtained by drilling age sample. Obtained by detecting:Dongshan piedmont fault was consisted of three faults, Three faults F1, F3 dip westward, F2 dip East, F1 is dominated fault.Fault breakpoint buried about 16.7 m, faulted middle Pleistocene stratum, Fault distance is about 23.96 m. Age of fault activity is middle Pleistocene. The results have corrected the conclusion of the previous studies that it is the late Pleistocene active fault. The results provide a key basis for the seismic hazard analysis of Taiyuan basin, and also play an important role in urban planning and construction of Taiyuan. Compared three methods:multi-channel DC exploration can preliminary determine the fault location, The high resolution seismic exploration and drilling geological section is the effective method to determine the location and activity of the buried faults.