Abstract: In the area around Kalpintag thrust system, earthquakes occurred frequently and intensively. The fundamental data and detailed investigation about active tectonics and the law of earthquake recurrence in this region are desiderated. So, 12 scenes of Landsat-7 ETM digital images are chosen and processed exclusively for the active tectonics. Then, two color composite images of 30m-resolution over the region are portrayed with bands 3-2-1 and bands 7-4-3 as R-G-B respectively, while two color composite images of 15m-resolution over the field workaround are fused with bands 3-2-1-8 and bands 7-4-3-8, respectively. With these resulting images, we designed some geological interpretation criteria for active tectonics of Kalpintag thrust system. According to these criteria, active tectonics of the area around Kalpintag thrust system are interpreted with scales of 500,000, while those of three sites on the field workaround are interpreted in detail with scales of 50000, by means of contrastive interpretation with two kinds of different images at one time. At last, the field investigation confirmed that the used techniques of processing and interpretation in this research were resultful.

Key words: active tectonics, ETM image, Kalpintag

摘要： 柯坪塔格推覆系所在的区域地震活动频繁而且强烈,关于推覆系的活动构造和(古)地震复发规律亟需具体的基础资料和深入的认识。为此,对挑选的12景Landsat-7ETM影像进行了活动构造专题数字图像处理,并得到推覆系区域范围30m分辨率的ETM3-2-1波段、ETM7-4-3波段(假)彩色合成影像和野外工作区范围15m分辨率的ETM3-2-1-8波段、ETM7-4-3-8波段(假)彩色合成影像各2幅。通过对这些影像的分析和研究,确定了推覆系活动构造的主要解译标志:地形地貌标志、地层标志、线性影像标志和水系标志等。根据这些标志,采用2种影像在同一软件平台的不同图层同时对比解译的方法进行了1/50万区域范围活动构造宏观解译和1/5万局部地点活动构造详细解译。经野外科考工作证实,所采用的数字图像处理技术手段、结果和解译方法是有效的。

关键词: 活动构造, ETM影像, 柯坪