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This last happened at the Yellowstone volcano approximately 650,000 years ago. The caldera that it left is 53 miles long and 28 miles wide. In the area surrounding Yellowstone, 3000 square miles were subjected to a flow of pyroclastic material composed of 240 cubic miles of hot ash and pumice.
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www.unmuseum.org/supervol.htm
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DESCRIPTION: Yellowstone Caldera, Wyoming ... From: Dzurisin, Christiansen, and Pierce, 1995, Yellowstone: Restless Volcanic Giant: VOLCANO HAZARDS FACT SHEET: USGS Open-File Report 95-59...
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vulcan.wr.usgs.gov/Volcanoes/Yellowstone/description_ye...
vulcan.wr.usgs.gov/Volcanoes/Yellowstone/description_yellowstone.html
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Deformation Project - CVO Project Menu -- general information about Volcano Deformation Project, including the monitoring of Yellowstone Caldera ... Yellowstone Caldera - Visit A Volcano -- includes information, maps, links, etc.
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vulcan.wr.usgs.gov/Volcanoes/Yellowstone/framework.html
vulcan.wr.usgs.gov/Volcanoes/Yellowstone/framework.html
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We have all of the pre warning signs of a major eruption from a super volcano. - I want everyone to leave Yellowstone National Park and for 200 miles around the volcano caldera."
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www.earthmountainview.com/yellowstone/yellowstone.htm
www.earthmountainview.com/yellowstone/yellowstone.htm
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Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has stopped for now. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 ... The Yellowstone Volcano Observatory (YVO) was created as a partnership among the U.S.
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volcanoes.usgs.gov/yvo/
volcanoes.usgs.gov/yvo/
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Not many people know that Yellowstone is a caldera volcano and it is one of the largest and most active calderas in the world. ... The youngest caldera is an elleptical depression, nearly 50 miles long and 30 miles wide, that occupies much of Yellowstone National Park. This caldera is buried by several extensive rhyolite...
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spot.pcc.edu/~mhutson/cas112_final_project/yellowstone....
spot.pcc.edu/~mhutson/cas112_final_project/yellowstone.htm
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Yellowstone National Park includes the center of a large, recently active volcano - the Yellowstone Caldera complex. This page and the next show the major stages in the its history, based on Christiansen (2001) (U.S. Geological Survey).
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www.lpi.usra.edu/education/EPO/yellowstone2002/workshop...
www.lpi.usra.edu/education/EPO/yellowstone2002/workshop/y_caldera1/index.html
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The geology of the Yellowstone Caldera volcano is difficult to decipher in the field, much less from satellite photographs. Many of the lavas look very similar, and geology is not closely correlated with topography, as at the Valles Caldera volcano.
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www.lpi.usra.edu/education/EPO/yellowstone2002/workshop...
www.lpi.usra.edu/education/EPO/yellowstone2002/workshop/y_caldera2/index.html
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Granted, it's not your typical volcano, either in scale (it's huge), appearance (it's a vast depression, not a single mountain) or frequency ... The crater atop Mount St. Helens is about 2 square miles. The Yellowstone "caldera" — a depression in the Earth equivalent to a crater top — is some 1,500 square miles.
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dsc.discovery.com/convergence/supervolcano/under/under....
dsc.discovery.com/convergence/supervolcano/under/under.html
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