Abstract: Based on the conservation of energy,we establish a mechanical model to study the direct and the secondary effects of the impact between a Fe-Ni alloy asteroid and the South Pole. The secondary disaster is the indirect effect leaded by the earthquake, tsunami, air dust and shaken ice. Based on the calculation of our model, we find that the direct effects of the impact are limited and will attenuate in a short time.

Key words: secondary disaster, conservation of energy, evaluation of disaster