中文摘要：

塔藏断裂位于东昆仑断裂带东段，属于“玛曲空区”范围，汶川Ms8.0级地震对该区域造成了应力的加载，但是本区尚未开展古地震方面研究，地震危险性认识不足。通过断错地貌实测、古地震探槽、^14C定年等方法，在坡中谷、断塞塘附近位置开挖两处探槽，获得了一些古地震方面的认识。探槽附近微地貌测量结果表明，断错量主要分布在两个范围区间72m和71m，以及27m，25和22m，两区间之间近倍数关系，推测由多次地震事件造成。两处探槽采集^14C样品共计19个，探槽剖面分别记录了2次古地震事件，事件发生的层位与年龄具有一定的可比性，经逐次限定后得到2次古地震事件，时间分别为320±30～500±30aB.P.和2730±30～2840±30aB.p.;最近一次古地震离逝时间为320±30～500±30aB.P.;实际重复间隔约为2300a，与东昆仑断裂玛曲段的重复间隔较为接近。

英文摘要：

The East Kunlun active fault zone in northern Tibetan is typically characterized by sinistral strike-lip fault. Tazang Fault is situated in the east segment of the East Kunlun active fault as well as in the scope of ＂Maqu seismicgap＂. The coulomb stress on the region around Tazang fault was increased due to the Wenchuan Ms8. 0 earthquake.However, there is little quake-proof research work about paleoearthquakes and the seismic risk of the region has not been profoundly recognized. Based on field investigations, the interpretation of remote sensing images ,the measurement of earthquake-related landforms by difference global positioning system, trench excavating and radiocarbon dating of^14Cby Accelerator Mass Spectrometry （AMS）, the paper tries to find out some evidences and knowledge about thecharacteristics of paleoearthquakes of the fault in the Late Quaternary. Two trenches were excavated near the sagponds, the lower edge of reverse scar and slop-hanging-ditch structure, which is perpendicular to the fault-strike. Highprecision surveying work was carried out by the method of difference global positioning system around the two trenches in order to carefully study the characteristic of geomorphology near the trenches and define the positions of trenches. According to the statistics of 1364 difference global positioning systemmeasurement data around Trench 1（33°45＇45.50＂N,103°15＇25.70＂E）,the left-slip displacementsof three nearly north-south trending gulliesperpendicular to the fault-strike are respectively as follows： 72m ,27m, and 25m. On the other hand ,based on the 3566difference global positioning system measurement data around Trench 2（33°47＇37.00＂N,103°10＇8.50＂E）,which islOkm to the west of Trench 1 ,the left-slip displacement of a nearly north-south trending terrace ridge on the west side of the trench nearly perpendicular to the fault-strike is about 71m and the left-slip displacement of a nearly northsouth trending terrace ridge on the east side of the trench is abou