Type of Volcano
Caldera volcanos is a cauldron-like volcanic feature
usually formed by the collapse of land following a
A collapse is triggered by the emptying of the
If the magma is high in silica the cauldron is often
ﬁlled with igneous rocks.
Yellowstone's last eruption
last occurred 64000 years
Eruptions of the Yellowstone
volcanic system have
included the two largest
volcanic eruptions in North
America in the past few
This volcano was discovered in 1980
The three super eruptions occurred 2.1 million, 1.3 million,
and 640,000 years ago, forming the Island Park Caldera, the
Henrys Fork Caldera, and Yellowstone calderas, respectively.
Within the past 17 million years, 142 or more caldera-forming
eruptions have occurred from the Yellowstone hotspot.
Due to the volcanic and tectonic nature of the region, the
Yellowstone Caldera experiences between 1000 and 2000
measurable earthquakes a year, though most are relatively
minor, with a magnitude of 3 or weaker.
+volcanoes&aq=f&aqi=g10&aql=&oq=&gs_rfai=&start=0s8.nytimes.com/images/2006/05/13/world/volcano2.large.jpg March 18 2010
http://www.sftext.com/map/volcanoes_names.html March 18 2010
http://www.extremescience.com/zoom/index.php/volcanoes/24-caldera-volcano March 18 2010ttp://images.google.com/imgres?
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http://www.eos.ubc.ca/courses/Dist-Ed/SyllabusImages/tungurahua-volcano.jpg March 18 2010
March 18 2010
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