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Votes:0 USGS/Cascades Volcano Observatory, Vancouver, Washington Earthquakes, Volcanoes, and Plate Tectonics Return to: [Plate Tectonics Menu] ... [Earthquakes and Seismicity Menu] ... URL for CVO HomePage is: <http://vulcan.wr.usgs.gov/home.html> URL for this page is: <http://vulcan.wr.usgs.gov/Glossary/PlateTectonics/Maps/map_quakes_volcanoes_plates.html> If you have questions or comments please contact: <GS-CVO-WEB@usgs.gov> 01/02/03, Lyn Topinka Read More Go to Site
Votes:0 VOLCANIC HAZARDS Hawaiian volcanoes can erupt either at their summits or on their flanks. YoungHawaiian volcanoes, such as Kilauea and Mauna Loa, have summit calderas. Acaldera is a crater several miles in diameter that forms as the result ofcollapse when magma drains from beneath the summit. (Magma is the term used formolten rock that is still beneath the earth's surface; it is called lava when itreaches the surface.) Summit eruptions of Kilauea and Mauna Loa occur within ornear their calderas. Flank eruptions usually take place along rift zones, whichare highly fractured zones of weakness within the volcano. Rift zones typicallyextend from the summit of a volcano toward the coastline and may continue formany miles under the sea. The Pu'u 'O'o vent began erupting in 1983 on Kilau Read More Go to Site
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