GEOPHYSICAL ASPECTS OF TUNGUSKA EVENT.
Russia, Moscow email@example.com
It is shown that Tunguska event took place during a rather specific and rare combination of geophysical circumstances on regional, as probably on larger scale (global?) level. Seismic activity in the Baikal Lake region had a sharp raise at the end of June-beginning July 1908. Also there were increased number of earthquakes registered globally on June 30 and July 1, 1908. Regional meteorological conditions were also peculiar. There was a change from period of clear weather to overcast and thunderstorm-type weather (with nail) on the first half of June 30 in the region of the event. The time of the Tunguska event exactly coincides with a peak of airpressure strong upsurge in the region, which commenced a couple days earlier.
By the way, the connection of Tunguska event with cloudiness level change and with the airpressure variations were discovered by the author intentionally, as they were predicted by his "tectonic Tunguska" and "geophysical meteors" (see my abstract nearby) idea. In other words, the tectonic Tunguska interpretation is the only one, which was able to correctly predict new discoveries (which were confirmed later)!
All these facts point that Tunguska was a result of instabilities inside the Earth coupled with atmospheric instabilities in very rare favourable combination of geophysical and other factors.