基于Worldview\|Ⅱ遥感影像的西藏改则地区断裂构造解译研究及应用

提出一种Worldview-Ⅱ遥感影像数据图像处理的方法,并利用高分辨率Worldview-Ⅱ遥感影像数据进行断裂构造解译。结合ETM+遥感影像和已有构造模型,辅助地形地貌特征分析,首次对高海拔、地面工作部署困难的西藏改则附近区域进行了大范围、精细的构造解译工作。结果表明,Worldview-Ⅱ遥感影像数据在构造解译方面具有分辨率高、准确有效的特点。根据解译结果得知,研究区在南北向最大主应力(S1)与东西向最小主应力(S3)的应力模式下,东西向逆冲断层、南北向正断层及北东或北西向走滑断层组合出现,并共同实现研究区内的南北向缩短和东西向伸展。区内的地形地貌总体上都受到构造控制,最为显著的表现包括:①热拉错发育在由南北向正断层所产生的地堑构造之上；②吓嘎错为北西走向右行走滑断裂尾端走向偏转所产生的拉分盆地；③改则洪积扇平原的发育受北东走向张扭性左行走滑断层控制。

The Study of Structural Interpretation based on Worldview-Ⅱ Remote Sensing Image in Gaize,Tibet and Its Application

This paper introduces the image processing methods of Worldview-Ⅱ image data and the study on the interpreting of structure.By employing ETM+ and Worldview-Ⅱ remote sensing images,with geomorphic analysis,to carry out structural interpretation in Gaize area,west-central Tibet,China.It is the first time to do such big range of remote sensing interpreting on the Gaize area,where is at high altitude,and difficult to deploy the ground work in.The results suggested that the interpretation works have gotten the good results based on Worldview-Ⅱ remote sensing images.And according to the results,there are three types of fault structures developed in the area,i.e.E-striking thrusts,N-striking normal faults and NE-or NW-striking strike-slip faults,in response to the prevailing stress regime of N-S maximum stress and W-E minimum stress that results in the N-S contraction and W-E tension in Tibet.Remarkable geomorphic features have been controlled by the fault structures:① the Relacuo lake to the north of the Gaize town is developed on a graben bounded by N-S striking normal faults;② the Xiagacuo lake is formed on a bend-release basin as a result of the transtensional horsetail termination of a NW trending dextral strike-slip fault;③the fluvial plain to the north of Gaize is controlled by a NE-trending transtensional sinistral strike-slip fault.