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Novarupta volcano

Caldera 841 m / 2,759 ft
United States, Alaska Peninsula, 58.27°N / -155.16°W
Current status: normal or dormant (1 out of 5) | Reports
Novarupta volcano books
Last update: 26 Dec 2019 (Volcanic Ash Advisory)
Typical eruption style: unspecified
Novarupta volcano eruptions: 1912  No recent earthquakes
TimeMag. / DepthDistanceLocation

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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