At around 7:17 a.m., Tungus natives and Russian settlers in the hills northwest of Lake Baikal observed a column of bluish light, nearly as bright as the Sun, moving across the sky. About 10 minutes later, there was a flash and a loud knocking sound similar to artillery fire that went in short bursts spaced increasingly wider apart. Eyewitnesses closer to the explosion reported the sound source moving during each barrage, east to north. The sounds were accompanied by a shock wave that knocked people off their feet and broke windows hundreds of miles away. The majority of eyewitnesses reported only the sounds and the tremors, and not the sighting of the explosion. Eyewitness accounts differ as to the sequence of events and their overall duration.
The explosion registered on seismic stations across Eurasia. Although the Richter scale was not developed until 1935, it has been estimated that in some places the shock wave would have been equivalent to an earthquake of 5.0 on the Richter scale. It also produced fluctuations in atmospheric pressure strong enough to be detected by then recently invented barographs in Great Britain. Over the next few weeks, night skies were aglow such that one could read in their light, sometimes called bright nights. In the United States, the Smithsonian Astrophysical Observatory and the Mount Wilson Observatory observed a decrease in atmospheric transparency that lasted for several months.
The Guinness Book of World Records (1966 edition) states that due to the rotation of Earth, if the collision had occurred 4 hours 47 minutes later, it would have completely destroyed the Imperial Russian Capital City of Saint Petersburg (Leningrad).
 Selected eyewitness reports
Photo tomada 19 anos despues del evento, en 1927
Aqui pueden apreciar el tamaño del area destruida.
La zona hoy
Piensan quel meteoro exploto en el aire asi