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Tunguska Event卫星地图 (全球陨石坑名单)

From: http://www.du.edu/~jcalvert/geol/kamchat.htm#Tung An event occurred at 0h 14m 28s UT 30 June 1908 near the Stony Tunguska River in Mid-Siberia, at latitude 60° 53' 09" N, longitude 101° 53' 40" E. On seismographs, it recorded like a 12.5 megaton air burst at 8.5 km altitude, and its effects were strongly felt over 2150 km2, one of which was the mass blowing over of trees. Since meteorite fragments were not found, it is supposed that this was something like a comet head, composed of ice and dust, that collided with the earth. Events of this kind would leave no geological record, so we have no idea how common they are.