关键词: 活动断层填图, 构造地貌, 航片解译

Abstract:

High speed development of remote sensing technique and high-resolution remote sensing data promotes greatly the study of active tectonics and seismo-geology.Recently,much more remote sensing techniques have widely been applied to active fault mapping.How to utilize sufficiently the various remote sensing techniques and various remote sensing data to increase the efficiency and quality of mapping has attracted eyes of many scientists.In all of the remote sensing information sources,aerial photograph has played a more important role in the interpretation of active tectonics,because of its high resolution and high intuitiveness.In the middle and late periods of last century,a lot of aerial photographs had been bought by institutes and local branches of China Earthquake Administration,especially the western provinces.These aerial photograph data are worth to pay more attention and to re-utilize when we do the active fault mapping,because of the following reasons: 1)almost no extra expense needed to be paid; 2)having excellent stereo vision; 3)having better original landform because they were shot before the high-speed economic development of the country.In this paper,some problems of air-interpretation in active fault mapping have been discussed: 1)interpreting the unusual landform,which is controlled by faulting; while the usual landform is that controlled by erosion; 2)interpreting landform classification map,because linear image is not equal to linear structure,and linear structure is not equal to active fault,either; 3)distinguishing strictly the credible,buried and conjectured fault traces; 4)restoration of offset is not only to estimate displacement along a fault but also to identify effectively whether the abnormal bending of rivers is controlled by faulting.Finally,we hope that these discussions should help the future research on the active tectonics and the active fault mapping.

Key words: active fault mapping, tectonic geomorphology, interpretation of aerial photograph