青藏铁路格尔木—唐古拉山口段主要线性构造ETM影像特征

青藏铁路格尔木－唐古拉山口段生态环境脆弱，地质环境复杂。ETM遥感图像显示：主要线性构造相对集中分布在纳赤台，望昆，五道梁，二道沟，雀巧等路段。线性构造多呈平直，舒缓波状线性影象，条带，线（带）状色调异常等。沿线性构造断裂谷，断层三角面发育，湖泊，水塘排列规则，水系流向变化有序。其中望昆路段线性构造密集，伴有第四纪断裂谷地，山麓洪积扇发育，水系呈平行束状或同步弯曲，现代地震频繁，属新构造活动强烈地段。

Characteristics of Major Linear Structures Shown by ETM Data of the Geermu-Tanggula Mountain Pass Section along the Qinghai-Xizang Railway

The environment of the Geermu Tanggula mountain pass section along the Qinghai Xizang Railway is delicate, and the geological setting is complicated. ETM remote sensing data reveal that linear structures are distributed mainly along Nachihe, Wangkun, Wudaoliang, Erdaogou, and Queqiao sections. Linear structures always present straight or slightly wavelike linear images and stripe shaped tonal abnormality. Along the linear structures there are lots of fault valleys and fault facets, regularly arranged lakes and pools, and regularly varying flow directions of water systems. The linear structures along the Wangkun section are dense. There are many piedmont flabellate diluvia; the rivers in the water system run parallel with each other and turn simultaneously; contemporary earthquakes happen frequently. It is a region of fierce Neo tectonic movement.