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Volcanic Ash Fallout
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Related Document
Download Options
| Name | Type | Width x Height x Frames | Size |
|---|---|---|---|
| ash1.mov | Quicktime | 968K |
This video clip was taken from "Understanding Volcanic Hazards", © 1995, International Association of Volcanology and Chemistry of Earth's Interior (IAVCEI). The following was taken from the video:
An exploding volcano blasts molten rock and ash into the air with tremendous force. The heaviest fragments fall back to the ground usually within a few kilometers of the vent but the dust size ash fragments continue to rise into the air forming a hugh billowing cloud of ash. This is the most common type of activity produced by explosive eruptions.The largest eruptions spew ash for hours at a time. Some continue erupting ash for several days to weeks. The ash clouds can be enormous, reaching more than 30 kilometers above a volcano in only 30 minutes. Once in the air, particles of ash drift with the wind. The smallest particles may be carried hundreds of kilometers downwind from a volcano, filling the sky with a dark cloud of ash as far as the eye can see.