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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, 15 Oct
Sun, 15 Oct 08:57 UTCM 1.1 / 0.6 km4 km- 95km SE of King Salmon, Alaska
Sat, 14 Oct
Sat, 14 Oct 02:44 UTCM 0.82 km- 98km NW of Larsen Bay, Alaska
Fri, 13 Oct
Fri, 13 Oct 16:53 UTCM 1.9 / 9.7 km31 km- 69km NW of Larsen Bay, Alaska
Fri, 13 Oct 09:36 UTCM 1.7 / 81.3 km27 km- 78km NW of Larsen Bay, Alaska
Fri, 13 Oct 09:04 UTCM 0.8 / 4.3 km2 km- 96km SE of King Salmon, Alaska
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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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