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El Misti Volcano, Peru
El Misti, Peru's best known volcano, is a symmetrical stratovolcano that towers above the city of Arequipa.
It is seen here from the west at the margin of Arequipa's airport.
The modern symmetrical cone has a small, 1.5-km-wide summit caldera containing nested craters.
It caps an older Pleistocene volcano that collapsed, producing debris avalanches to the west and SW.
El Misti's most recent activity has been dominantly pyroclastic.
Historical eruptions date back to the 15th century.
El Misti, Peru's most well-known volcano, is a symmetrical andesitic stratovolcano with nested summit craters that towers above the city of Arequipa.
The modern symmetrical cone, constructed within a small 1.5 x 2 km wide summit caldera that formed between about 13,700 and 11,300 years ago, caps older Pleistocene volcanoes that underwent caldera collapse about 50,000 years ago.
A large scoria cone has grown with the 830-m-wide outer summit crater of El Misti.
At least 20 tephra-fall deposits and numerous pyroclastic-flow deposits have been documented during the past 50,000 years, including a pyroclastic flow that traveled 12 km to the south about 2000 years ago.
El Misti's most recent activity has been dominantly pyroclastic, and strong winds have formed a parabolic dune field of volcanic ash extending up to 20 km downwind.
An eruption in the 15th century affected Inca inhabitants living near the volcano.
Some reports of historical eruptions may represent increased fumarolic activity.
PHOTO SOURCE: Norm Banks, 1988 (U.S. Geological Survey), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
NOTE: The information regarding Volcano on this page is re-published from other sources. No claims are made regarding the accuracy of Volcano information contained here. All suggestions for corrections of any errors about Volcano photos should be addressed to the copyright owner noted below the photo.
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This page was last modified 23-FEB-10
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