基于遥感技术研究依兰-伊通断裂带

郯庐断裂带是中国东部的大型走滑断裂,在沈阳以北由一支分为两支:依兰—伊通断裂带和敦化-密山断裂带。利用遥感数据并结合DEM(数字高程模型)数据对郯庐断裂带北段的依兰-伊通断裂带进行了分析研究。根据该断裂带的形态特征将其划分成三段(沈阳—开原段、开原—依兰段、依兰—萝北段)。沈阳—开原段为单条断裂,它分隔了下辽河平原和辽东山地;开原—依兰段为双边不对称断裂,两支断裂相向内倾形成地堑,隔大黑山分隔了松辽盆地和那丹哈达岭;依兰-萝北段断裂较为隐伏,该段是小兴安岭和三江盆地的分界。通过分析依兰—伊通断裂带对河流和其他断裂的错动情况,进一步揭示了郯庐断裂带曾经历了早期左旋走滑和后期右旋走滑的历史。另外还对伊通地堑进行了较为详细的描述及说明,通过对其DEM作横向和纵向的剖面分析证实了其西北边界为主要控盆断裂。

A study on Yilan-Yitong fault zone based on Remote Sensing Technology

Tan-Lu fault zone is the great strike-slip fault in eastern of China.It is composed of Yilan-Yitong fault zone and Dunhua-Mishan fault zone in the north of Shenyang city.In this paper we study Yilan-Yitong fault zone by selecting RS data and DEM data.We divide the fault into three segments according to the geometrical and geomorphologic characteristics of each segment.Shenyang-Kaiyuan segment is a single fault that separating Xialiaohe plain and Liaodong Mountains.Kaiyuan-Yilan segment is the asymmetric fault having two boundaries.The graben is formed in the middle of two boundaries separating Songliao basin and Nadanhada Mountain.Yilan-Luobei segment is the dividing line of the Xiaoxing'an rang and Sanjiang basin.The displacement of the rivers and the other faults due to Tan-Lu fault shows the development history of sinistral strike slip early and dextral strike slip later.In addition,we described in detail Yitong graben,and proved the northwest boundary is the main fault by using DEM data in Yitong graben area.