Geophysical Circumstances Of The 1908 Tunguska Event In Siberia,Russia

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.     

New data on accounts of the 1908 Tunguska event

There has been a longstanding debate about the nature of the 1908 Tunguska event. Many eyewitness accounts were collected more than half of a century after the event. Among these are many second‐hand oral accounts after the generation of eyewitnesses faded away. However, several years ago, two valuable publications appeared containing first‐hand eyewitness accounts collected by a Russian ethnographer, Sev'yan Vainshtein, during an expedition to the settlement of Sulomay in 1948. This paper presents additional details of these accounts, based on the author's discussions with Vainshtein before he died in 2008, and demonstrates how these accounts shed new light on what happened in Tunguska in June 1908.