Abstract: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.
