Novarupta's lava dome in July 1987.
|Elevation||2,759 ft (841 m)|
|Location||Katmai National Park and Preserve, Alaska, U.S.|
|Topo map||USGS Mount Katmai B-4|
|Type||Caldera with lava dome|
|Volcanic arc/belt||Aleutian Arc|
|Last eruption||June to October 1912|
Novarupta (Russian: Вулкан Новарупта, literally "new eruption") is a new volcano that was created in 1912, located on the Alaska Peninsula in Katmai National Park and Preserve, about 290 miles (470 km) southwest of Anchorage. Formed during the largest volcanic eruption of the 20th century, Novarupta released 30 times the volume of magma of the 1980 eruption of Mount St. Helens.
Eruption of 1912
|1912 eruption of Novarupta|
|Date||June 6–8, 1912|
|Location||Aleutian Range, Alaska
The eruption of Novarupta within the Aleutian Range began on June 6, 1912, and culminated in a series of violent eruptions from the original Novarupta volcano. Rated a 6 on the Volcanic Explosivity Index, the 60-hour-long eruption expelled 13 to 15 cubic kilometers (3.1 to 3.6 cu mi) of ash, 30 times as much as the 1980 eruption of Mount St. Helens. The erupted magma of rhyolitic, dacitic, and andesitic composition resulted in more than 17 cubic kilometers (4.1 cu mi) of air fall tuff and approximately 11 cubic kilometers (2.6 cu mi) of pyroclastic ash-flow tuff. During the 20th century, only the 1991 eruption of Mt. Pinatubo in the Philippines was of a similar magnitude; Pinatubo ejected 11 cubic kilometers (2.6 cu mi) of tephra. At least two larger eruptions occurred in the 19th century: the 1815 eruption of Tambora (150 km3 (36.0 cu mi) of tephra) and the 1883 eruption of Indonesia's Krakatoa (20 km3 (4.8 cu mi) of tephra).
Novarupta occurred about 2.5 miles from the peak of volcanic Mount Katmai and 4,000 feet below the post-eruption summit of Mount Katmai. During the eruption a large quantity of magma was removed from underneath the Mount Katmai area, resulting in the formation of a 2-kilometer (1.2 mi) wide, funnel-shaped vent and the collapse of Mount Katmai's summit, creating a 600-meter (2,000 ft) deep, 3 by 4 km (1.9 by 2.5 mi) caldera.
The eruption ended with the extrusion of a lava dome of rhyolite that plugged the vent. The 295-foot (90 m) high and 1,180-foot (360 m) wide dome and the caldera it created form what is now referred to as Novarupta.
Valley of Ten Thousand Smokes
Pyroclastic ash flow from the eruption formed the Valley of Ten Thousand Smokes, named by botanist Robert F. Griggs, who explored the volcano's aftermath for the National Geographic Society in 1916.
Katmai National Park
Established as a National Park & Preserve in 1980, Katmai is located on the Alaska Peninsula, across from Kodiak Island, with headquarters in nearby King Salmon, about 290 mi (470 km) southwest of Anchorage. The area was originally designated a National Monument in 1918 to protect the area around the 1912 eruption of Novarupta and the 40-square-mile (104 km2), 100-to-700-foot (30 to 210 m) deep, pyroclastic flow of the Valley of Ten Thousand Smokes.
- List of volcanoes in the United States
- Timeline of volcanism on Earth
- Parícutin, a cinder cone volcano in Mexico whose emergence could be fully observed.
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- "Novarupta – Historic eruptions". Alaska Volcano Observatory. 2012-11-06. Retrieved 2012-12-19.
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- USGS collection of descriptions of Novarupta
- USGS QuickTime video clip on Novarupta (36 seconds/0.8 MB)
- geology.com, Novarupta – topographic maps, annotated satellite images
- Alaska Volcano Observatory: Novarupta
- USGS Photographic Library – novarupta