If you arrived here by any means other than from the Index of Impacts,
it is suggested that you start at the Introduction to gain an understanding of what follows.
The Tunguska Event

At around 7:17 a.m. local time, on June 30, 1908 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 sound similar to artillery fire. Eyewitnesses closer to the explosion reported the sound source moving east to north. The sounds were accompanied by a shock wave that knocked people off their feet and broke windows hundreds of kilometers away. The majority of witnesses 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. 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 in Great Britain. Over the next few days, night skies in Asia and Europe were aglow; it has been theorized that this was due to light passing through high-altitude ice particles formed at extremely cold temperatures, a phenomenon that occurred again when the Space Shuttle re-entered the Earth's atmosphere. In the United States, the Smithsonian Astrophysical Observatory and the Mount Wilson Observatory observed a decrease in atmospheric transparency that lasted for several months, from suspended dust.

Read more about The Tunguska Event at

      The above image shows the area circled, with the center of impact being the tiny crosshair in the center of the image. The coordinates of the cross hairs are in the center black box in the image. This image is expandable for more definition, and is linked to a larger image of 2400 x 1210 pixels. This center of impact is about 2.4 kilometers southwest of the 60° 55' N 101° 57' E position, where the center of the blast was marked. The center of the blast was where the trees were all blown down in a circular pattern, away from this point. This variation could be because the asteroid, coming in from the Northeast, exploded just before impact, knocking the trees down, then impacting 2.4 kilometers later. Also, the coordinates at the time were only given to the accuracy of degrees and minutes.

     At 4 kilometers from the center of impact, the shock wave from the impact caused the alignments shown by the arrows.

      At 6 kilometers to the northwest, the alignments are shown.

At 6 kilometers to the south, the alignments are shown.

At 8 kilometers to the northwest

At 8 kilometers to the South.

At 15 kilometers.

At 27 kilometers, this appears to be one of the more definative rings. The image is linked to a larger image for a closer inspection (2400 x 1210 pixels)

At 36 kilometers Northeast.

At 36 kilometers East.

At 42 kilometers North.

At 42 kilometers Southeast.

At 70 kilometers North.

At 70 kilometers Southeast.

At 70 kilometers Southwest.

At 106 kilometers Northeast.

At 106 kilometers Southeast.

At 106 kilometers Southwest.

At 175 kilometers Southwest.

At 235 kilometers Northeast.

At 235 kilometers East.

At 235 kilometers Southeast.

At 600 kilometers.

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Index of Impact Sites
© 2012 Terry Westerman