Volcanic dam

Volcanic dam

A volcanic dam is a dam produced by volcanic activity. There are two main types: lava dams and pyroclastic dams.

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. [ [http://gsc.nrcan.gc.ca/volcanoes/cat/feature_garibaldi_e.php Catalogue of Canadian volcanoes:Garibaldi Lake volcanic field] Retrieved on 2007-07-30]

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.

Hazards

The failure of volcanic dams by erosion can produce catastrophic landslides, debris flows and floods if impounding a large lake.

ee also

*Volcanic plateau

References


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