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Rockfall is defined by Varnes (1978) as a type of instability in which rock blocks released from rock masses on steep slopes and move at high speed down along the slope. The rock block releases from the source point moves downward along a trajectory until its energy is extinguished. In deterministic approaches, a large number of physical and mechanical parameters of both slope surface and block, are used as inputs, and therefore the results are closely related to accuracy of this number of input parameters. As a reflection of this, empirical approaches, which have a very high practical value, are preferred especially in the preparation of rockfall maps on regional scale. The cone propagation approach proposed by Jabodeyoff and Labiouse (2011) is a practical method for regional scale and stands out among other empirical approaches due to uses only source area map and digital elevation model (DEM) as input parameters. In this study, in order to test this method various field studies were carried out in Kargabedir rockfall area based on the principle of determination of possible propagation zone on DEM. In the field studies carried out at Kargabedir Hill, high resolution aerial photos of the region were taken using a Dron (unmanned aerial vehicle-UAV) to obtain a high resolution DEM. Thus, a high-resolution (40 cm/pixel) DEM and a very high resolution (5 cm/pixel) orthorectified aerial image were generated for the area. Propagation zone maps of Kargabedir rockfall area were prepared for different energy line angle values using high-resolution DEM with cone propagation approach. In addition, the positions and dimensions (height/length/width) of the fallen blocks were measured in the region. The dimensions and positions of the fallen blocks were also determined from the orthophoto and their compatibility with the site measurements was examined. It has been observed that width-length-height measurements of the fallen blocks acquired from the field and orthophoto are compatible.

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