Pinatubo, the second largest volcanic eruption of the 20th century. The Valley of Ten Thousand Smokes is a valley within Katmai National Park and Preserve in Alaska which is filled with ash flow from the eruption of Novarupta on June 6–8, 1912. Following the eruption, thousands of fumaroles vented steam from the ash. The Mt. Source: Wikimedia Commons via Katmai National Park and Preserve The eruption of Novarupta on June 6 – 8, 1912 was the largest volcanic eruption in recent history in the United States. Here, we investigate the conditions under which the rhyolitic part of the erupted magma last resided in the crust prior to eruption. Novarupta spewed 13 cubic kilometers (3.1 cubic miles) of magma, which turned into 30 cubic kilometers (7.2 cu mi) of ash that blanketed the nearby area. The volume of volcanic ash from Novarupta was more than from all other historical Alaska eruptions combined. Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. This photo shows a close up of the edge of the Novarupta dome. 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. 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. Impact and aftermath. Novarupta is a pumice-filled depression that was the vent for the 1912 eruption. Novarupta reported activity, including all types of volcanic activity. Novarupta was given this name as, prior to its 1912 eruption, no volcano has existed in that location. The ash from Novarupta was launched … Recent studies have proposed contrasting models for the plumbing system that fed the 1912 eruption of Novarupta, Alaska. Katmai eruption deposited three times more ash and debris than the 1991 eruption of Mt. The dome is 1,300 feet ( 400 m) in diameter and about 210 feet (65 m) high. Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. The May 18, 1980, eruption was the most destructive in the history of the United States. Novarupta-Katmai Ash Resuspension. Novarupta, volcanic vent and lava dome, southern Alaska, U.S., located at an elevation of 841 metres (2,759 feet) within Katmai National Park and Preserve. Ash from seven prehistoric eruptions, all younger than 6,000 years and approaching the volume of the 1912 event, are found within 500 miles (800 km) of Anchorage, including ash from Hayes volcano (Bacon, et al., 2012) (Public domain.) Photo by Jay Robinson, National Park Service. 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