... 3m/second Extremely fast: >3m/second 1.4.1.2 Classifying according to A. Nemcok, J. Pasek and J. Rybar: In 1974, A. Nemcok, J. Pasek and J. Rybar (Czechoslovakia) has divided the displacements ... displacements of the slopes according to the forms of displacements and the types of materials in the sliding mass. According to the forms of displacements, it’s possible to divide the displacements ... flow landslides can vary from fast to very fast or extremely fast. - Collapse is the displacements of the rock mass from very fast to extremely fast speed. From the tope of the slope, the blocks...