<New Hypothesis Of The Tunguska Explosion
"The hypothesis that it was a meteorite or any other extraterrestrial object has not quite satisfied inquisitive minds, since too many puzzles remain unsolved. A geologist Vladimir Epifanov, Siberian Research Institute of Geology, Geophysics and Mineral, reported to the recent Conference "Degasification of the Earthe" (Moscow) that the reason for the explosion could have been a powerful fluid jet suddenly shot up from the depth of the planet. It seems that a moderate earthquake could have promoted the process.

The gas kick started nine days prior to the major explosion, a narrow jet of gases rushed up southbound. The fluid jet from under the earth was accompanied by dust, and the wind carried the dust to the west. In the upper layers of atmosphere a layer of aerosols was formed. This layer charged with electricity could have produced the fatal 'sparkle'. It put on fire the top of the liquid jet, and the fire ball rushed towards the Earth. In the oxygen saturated layer of atmosphere the fire ball exploded, the blast wave stirred up the ground, and the gas discharge ceased."