Volcanic dam
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A volcanic dam is a dam produced by volcanic activity. There are two main types: lava dams and pyroclastic dams.
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[edit] Lava dam
Lava dams are formed by huge lava flows during numerous successive eruptions through numerous vents, usually without violent eruptions.
Example include The Barrier, which impounds Garibaldi Lake in southwetern British Columbia, Canada.[1]
[edit] Pyroclastic dam
Pyroclastic dams are produced by massive pyroclastic flows and they are made by pyroclastic rocks: agglomerates, tephra, volcanic ash cemmented into tuffs, mafic of felsic.
[edit] Hazards
The failure of volcanic dams by erosion can produce catastrophic landslides, debris flows and floods if impounding a large lake.
