Parts of a volcano
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MAGMA CHAMBER PowerPoint PPT Presentation


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Parts of a volcano Also see the Glossary of volcano terminology http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html. The space where magma collects below a volcano. MAGMA CHAMBER. The channel through which magma rises to the surface. CONDUIT. Vent = the top of the conduit.

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MAGMA CHAMBER

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Magma chamber

Parts of a volcanoAlso see the Glossary of volcano terminologyhttp://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html

The space where magma collects below a volcano

MAGMA CHAMBER

The channel through which magma rises to the surface

CONDUIT


Magma chamber

Vent = the top of the conduit

Crater = rim of the vent

SUMMIT ERUPTION (Lava and other materials erupting from a vent on top)

Can also be FLANK eruption (materials erupting from a vent on the SIDE)


Magma chamber

A CALDERA forms

  • When the magma chamber of a volcano empties out and the volcano collapses (e.g. Crater Lake, Oregon)

    Or

  • When a volcano blows its top (e.g. Mount St. Helens)


Major types of volcanoes also see on line supplemental text http pubs usgs gov gip volc

Major types of volcanoes also see on-line supplemental texthttp://pubs.usgs.gov/gip/volc/

  • SHIELD VOLCANOES

  • Broad, gentle domes, formed from basaltic lava (Example: Hawaii)

  • Can havelava flows with smooth, glassy rope-like surfaces called PAHOEHOE, or

  • Lava flows with jagged broken surface called AA

  • CINDER CONES

  • Small, symmetrical conical pile of PYROCLASTS (meaning solid chunks of rocks and ash)

    Example: Sunset crater


Magma chamber

  • COMPOSITE VOLCANOES or STRATOVOLCANOES

  • Cone shaped, with alternating layers of lava and loose pyroclastics

    (Example: Mount Shasta, Mount Fuji)

  • Associated with subduction zones

  • Distributed around the Pacific ocean (Ring of fire) and Mediterranean sea


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