A series of consecutive explosions happened as pieces broke from the main incoming asteroid body. This model depicts them before the formation of mushroom-shaped cloud caps at the top. Space artist Don Davis has illustrated a version that compresses time and includes the moments when these clouds became visible. (See https://asteroidday.org/resources/asteroid-learning/did-the-tunguska-impact-leave-behind-any-meteorites/)
Note the Tunguska River in the background.
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