How did the avalanche form in Iran
Seven people were killed and 78 injured in an avalanche in Kiran Province in northern Iran due to heavy snow, Iranian state television reported on the 11th. Among the 7 people who died, 5 were killed at the avalanche site, and the other 2 were caused by high-altitude falling and roof collapse.
At present, the injured have been sent to hospital for treatment.
Avalanche is called 'Snow collapse', 'Snow quicksand' or 'mountain pushing snow' in some places. It is a natural phenomenon. It refers to a large number of snow avalanches caused when the cohesion of the snow can not resist 1 the gravity pull on the high mountains with snow all year round.
Avalanches mostly occur in mountainous areas. Common avalanches occur when snow has accumulated for a lot, and some are produced in extraordinarily heavy snowstorms. One of the reasons for avalanches is that on the high l of snow all year round, the temperature is very low, and the deeper the snow is, the lower the temperature is, which makes the snow pile I slowly form a deep 'white frost', that is, an ice crystal, which is similar to the ice we usually see. The formation of this kind of white frost is caused by evaporation. They are much looser than the upper snow, forming a weak zone between the ground or the lower snow and the upper snow. When the upper snow begins to slide down the L slope, this weak zone plays a role of lubrication, just like the relationship between the gears under the chain J of our bicycle. The more lubrication between the two, the less effort the bicycle pedals and the faster the f. Therefore, the more snow covered mountains all year round, the more prone to avalanches.
The second reason is that there are some loose gaps between the snow and ice on the mountain, and these! The gap will resonate under the influence of sound waves. Therefore, some loud noises sometimes stimulate people, resulting in sudden collapse on the snow covered mountain. Therefore, if j the shouting of mountaineers coincides with the natural frequency of snow on the mountain, it will also cause avalanches due to resonance.