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Novarupta volcano

Caldera 841 m / 2,759 ft
United States, Alaska Peninsula, 58.27°N / -155.16°W
Current status: dormant (1 out of 5)
Novarupta volcano books
Typical eruption style: unspecified
Novarupta volcano eruptions: 1912 
TimeMag. / DepthDistanceLocation
Sun, 18 Jun
Sun, 18 Jun 09:36 UTCM 1.5 / 1.7 km4 km- 103km NNW of Larsen Bay, Alaska
Wed, 14 Jun
Wed, 14 Jun 14:10 UTCM 1.2 / 71.5 km30 km- 71km NW of Larsen Bay, Alaska
Mon, 12 Jun
Mon, 12 Jun 23:38 UTCM 1.7 / 1.6 km2 km- 96km SE of King Salmon, Alaska
Mon, 12 Jun 18:24 UTCM 0.5 / 7.6 km6 km- 101km SE of King Salmon, Alaska
Mon, 12 Jun 05:42 UTCM 2.0 / 27.7 km1 km- 100km ESE of King Salmon, Alaska
View all recent quakes

Background:

Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. This eruption was the world's largest during the 20th century and produced a voluminous rhyolitic airfall tephra and the renowned Valley of Ten Thousand Smokes (VTTS) ash flow. At the end of the eruption a small, 65-m-high, 400-m-wide lava dome grew to an elevation of 841 m within the source vent of the VTTS ashflow, a 2-km-wide area of subsidence NW of Trident volcano. The NE side of the Falling Mountain lava dome of the Trident volcanic cluster, as well as Broken Mountain and Baked Mountain, was removed by collapse of the Novarupta depression, which is marked by radial and scalloped arcuate fractures. Much larger collapse took place at Katmai volcano, 10 km to the east, where a 3 x 4 km wide caldera formed in response to magma reservoir drainage toward Novarupta.
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Smithsonian / GVP volcano information


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