天山中段地区垂直形变特征与地震危险区

A PRIMARY STUDY ON THE CHARACTERISTICS OF VERTICAL DEFORMATION AND EARTHQUAKE-PRONE REGION AT THE MIDDLE SEGMENT OF TIANSHAN AREA

本文用动态秩亏自由网平差处理了天山中段地区的大面积水准资料,给出了该区现今垂直形变速率等值线图。分析了天山中段地区的垂直形变概貌及特征。指出博罗霍洛断隆带是现今垂直形变的高速隆起带;北天山构造带的垂直差异运动水平高于南天山构造带:沙湾—巩乃斯以西地段为垂直形变速率的高梯度带展布区,有可能是未来强震活动的危险区段。

The method of dynamic rank deficient free net adjustment was adopted to deal with the leveling data of the middle segment of the Tianshan area on a large scale and an isoline of present vertical deformation rate of the area has been made. Furthmore, a rough description on the chief feature of the vertical deformation was given as well as its characteristics. The result showed that the Bolehuoluo upwarped fault zone was a quick upwarping zone due to the present vertical deformation. It is also obtained that the level of the vertical difference movement is higher on the North Tianshan tectonic zone than on the South. And the future strong earthquakes risk region might be able to be located on the high gradients spreading region along the west segment of Shawan-Gongnaishi area.