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The explosion felled some 60 million trees across an area of 2000 square kilometers. Yet some trees near the blast center were not burnt and a ring of burnt trees circling the epicenter was left standing. The thunderous sounds were accompanied by a shock wave that knocked people off their feet and broke windows hundreds of kilometers away.
The explosion registered on seismic stations across Europe and Asia, and as far away as Britain meteorologists registered fluctuations in atmospheric pressure. The resulting pulse of air pressure circled the Earth twice, and astronomers observed for several nights afterwards a glowing red haze in the upper atmosphere, though they were not aware of the cause at the time. Curiously, reports of an unusually bright night sky began the night before the Tunguska event and continued for several days afterwards.
If there were smallpox outbreaks, I would imagine it to be stress and environmentally related to the completely changed environment and difficulties in finding food. Could you imagine a stressor more extreme than that?
Originally posted by C.H.U.D.
There is also this (EXTERNAL LINK) theory, which I think has come up on ATS before, which I suppose is also a possibility.. if only someone could find and verify one of those "bunkers" !