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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) | Reports
Novarupta volcano books
Typical eruption style: unspecified
Novarupta volcano eruptions: 1912 
TimeMag. / DepthDistanceLocation
Fri, 14 Sep
Fri, 14 Sep 06:03 UTCM 1.96 km- 103km ESE of King Salmon, Alaska
Wed, 12 Sep
Wed, 12 Sep 22:23 UTCM 1.6 / 111.1 km18 km- 101km SSE of King Salmon, Alaska
Sun, 9 Sep
Sun, 9 Sep 11:06 UTCM 1.4 / 80.2 km22 km- 80km NW of Larsen Bay, Alaska
Mon, 3 Sep
Mon, 3 Sep 08:02 UTCM 1.1 / 0.2 km27 km- 69km SE of King Salmon, Alaska
Mon, 3 Sep 04:10 UTCM 1.7 / 104.2 km5 km- 98km NW of Larsen Bay, 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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