关键词: 渭河断裂带, 构造演化, 伸展构造, 地震活动

Abstract: Transversing the axis of Weihe basin,the Weihe fault zone varied in nature in different geologic period:before the Cenozic it was a transcrustal paloefault zone cutting the basement,during the Cenozoic it changed into a listric extensional fault and formed the embryozic Weihe basin by extension and tilting and recently it has been Characteristic of an extension and dip slip along with hingelike movement.The fault is a famous seismic zone along which there have been 20 earthquakes with M≥5 since 280a B.C.

Key words: Weihe fault zone-Tectonic evolution, Extensional tectonics, Seismicity