关键词: 新疆, 乌恰, 地震形变带, 断层

Abstract: A deformation zone on the earth's surface along terrace in the Kezilesu River valley was formed by Wuqia earthquake of magnitude 7.4 in 1985. It is mainly composed of seismic scarps, seismic faults, fissures and the pressure ridges, etc. The length of the deformation zone is about 15 kilometres and the maximum width is 800 metres. The deformation zone extends in the direction of nearly east-west in the western part, and of 310-320℃ in the eastern part. The general distributional characteristic of this zone is a deformed arch which projects to northeast. The seismic fault is of different properties at the different section of the deformation zone. The thrust fault strikes to east-west and the fault plane dips to 160-210° with the angle of 30°. The maximum horizontal dip slip is about 2 metres. The normal-strike-slip fault strikes to 340-350° and fault plane dips to northeast with angle of 80-88°. The maximum right lateral offset is 1.55 metres. The strike-slip-thrust fault strikes to 280-305°and the fault plane dips to southwest with angle of about 30°. The maximum right lateral offset is 1.25 metres. Most of the compressire ridgas extends in the direction of east-wast and the maximum horizontal shortening distance is 0.4 metres.

Key words: Xinjiang, Wuqia, Deformabion zone of earthquake, Faults