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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
Wed, 3 Jan
Wed, 3 Jan 23:20 UTCM 1.8 / 0.3 km3 km- 91km SE of King Salmon, Alaska
Wed, 3 Jan 18:40 UTCM 1.5 / 0.7 km3 km- 91km SE of King Salmon, Alaska
Mon, 1 Jan
Mon, 1 Jan 16:21 UTCM 2.22 km- 93km SE of King Salmon, Alaska
Thu, 28 Dec
Thu, 28 Dec 05:10 UTCM 2.3 / 146.6 km32 km- 65km ESE of King Salmon, Alaska
Thu, 28 Dec 04:48 UTCM 2.1 / 1.1 km4 km- 92km 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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