...

This work originated from an idea of the late Paolo Farinella, deceased on March 25th, 2000. We dedicate it to him.

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...2000)

See also http://www-th.bo.infn.it/tunguska/

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... point

The azimuth is calculated from North to East starting from the meridian.

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... epicentre

Even though the term "epicentre'' is not proper, we will use it because it is now common in this type of studies. However, it is worth noting that by epicentre we understand the first contact point between the Earth surface and the shock wave from the airburst.

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