伊通河断裂及其稳定性评价

伊通河断裂的分布规律和危险性评价对长春市的发展和规划具有重要意义。在区域地质调查、区域地球物理数据处理基础上，利用地面电法、探地雷达和浅层地震探测，确定伊通河断裂呈近南北向分布，总体向西倾，倾角较大。根据探地雷达探测结果推断伊通河断裂切断白垩系地层，是一条早第四纪活动断层。分析伊通河断裂是强扭性断裂，处于伊通河断裂冲蚀谷地中。第四纪以来，特别是晚更新世以来，断裂活动趋于稳定，反生中强地震的概率很小。

Yitonghe fault and its stability estimation

The estimation on the distribution and risk of Yitonghe faults plays an important role in civil devel- opment and planning of Changchun City. Based on regional geological survey and geophysical data, the authors have confirmed that the Yitonghe faults distribute in north-south trending with west dipping and large dip angle, which was used the methods of surface electric survey, ground penetrating radar detection and reflection seismic survey. Through the radar detection, the authors infer the Yitonghe faults as Quaternary active faults, cutting off the Cretaceous formations, and define the Yitonghe faults as high torsional faults in Yitonghe erosion valley. Since Quaternary, especially the late Pleistocene, the Yitonghe faults have tended to stable, with small probability of moderate-strong earthquakes.