Fig. 1. Scheme of landslides on comet nucleus along cylinder-like surfaces due to aerodynamic load (application of Fellenius theory of soil stability)

Powerful aerodynamic load is able to deform solid meteor bodies. For example, destruction and deformation of solid meteor bodies were analysed by S.S.Grigorian [S.S.Grigorian, 1976, 1979]. However, processes in friable substance (friable soil) of comet nucleus seems considerably unique. There is possible another mechanism of nucleus deformation in lateral direction, which connects to landslide phenomenon. This phenomenon seems more real during initial stage of entrance into atmosphere of friable comet nucleus. Also let’s notice that landslides may take place many times during motion of comet nucleus through atmosphere. Well-known Fellenius theory is very reliable and considerably suitable for simple estimations of landslide phenomena in friable substance of comet. The author tested Fellenius theory during quasi three-dimensional modeling of Tunguska comet impact and found this test successful [Zlobin, 2007]. It was shown that Tunguska meteorites probably were dissipated on considerable lateral distance [Zlobin, 2013].