Abstract
On the morning of June 30, 1908 a remarkable naturalphenomenon took place in the region to the north and north-west of Lake Baikal in Russia, which is now usually known as the Tunguska event. Despite the fact that a dozen explanations or more have been put forward to explain this event, its origin is still questionable. In this work geophysical circumstances of the Tunguskaevent are investigated. The research reveals that the event took place during a strong upsurge of tectonic activity in the Tunguska event region, and there were some peculiarities in tectonic activity even on larger scales. Also the event occurred during a change from a long period of "good" weather to a ''bad'' one in the region. And there were also peculiarities in the atmosphere on larger scales at those times. In the author's opinion, this suggests that the Tunguskaevent was of geophysical origin. On much smaller scales similar geophysical events occur rather often.
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