航空像片在活断层研究中的应用

航片判读活断层的依据是断层地形学。航片判读活断层的关键是找出变位地形。变位地形是指由构造作用形成,非自然侵蚀作用所能形成的地形。航片判读变位地形的可信度分为三类。垂河向陡坎、背河向陡坎及反坡向陡坎被认为是可信度工的第四纪活动的变位地形。判读走滑断层的变位方向及变位量,需注意地貌面上的线性地物。利用不同变位基准的不同变位量可判读断层活动期次。本文通过中日航片判读活断层的14个实例,对变位地形的识别予以说明

APPLICATION OF AEROPHOTO INTERPRETATION TO STUDY OF ACTIVE FAULTS

The basis for interpretation of active faults in aerial photographs is the fault geomor-phology. The key to determining the active faults in aerial photographs is to find out the displaced landform which could not he formed by exogenetic force in nature. The confidence of the interpreted displaced landforms is of three levels. The scarps, their strike is perpendicular to the river's current diection, their dip opposite to the direction and their dip reverse to the slope, are the displaced landforms of confidence level I. We must pay attention to the linear landforms when we determine direction and displacement amount of strike-slip fault. We can determine the poriod and order of fault activity from different datum and displacement amount of the displaced landforms. In this article 14 examples of the interpreted active faults in China and Japan are described for explaining the dislplaced landforms in aerial photographs.