Novarupta (Katmai) Volcano, Alaska, erupted considerably more material in 1912, but owing to the isolation and sparse population of the region affected, there were no … 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.) Following the eruption, thousands of fumaroles vented steam from the ash. Novarupta reported activity, including all types of volcanic activity. The ash from Novarupta was launched … 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. 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. 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. 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. Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. The Mt. A rhyolite dome extruded into the vent after the eruption. Novarupta is a pumice-filled depression that was the vent for the 1912 eruption. 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. Pinatubo, the second largest volcanic eruption of the 20th century. Here, we investigate the conditions under which the rhyolitic part of the erupted magma last resided in the crust prior to eruption. Resuspension and transport of fine-grained volcanic ash from the Katmai National Park and Preserve region of Alaska have been observed and documented over the past several decades, but has likely been occurring ever since the 1912 Novarupta-Katmai eruption. Recent studies have proposed contrasting models for the plumbing system that fed the 1912 eruption of Novarupta, Alaska. This photo shows a close up of the edge of the Novarupta dome. The name Novarupta means "new eruption." Its violent eruption, which began on June 6, 1912, and lasted 60 hours, is considered the largest volcanic eruption of the 20th century. Impact and aftermath. Photo by Jay Robinson, National Park Service. A Novarupta magnitude eruption will have a significant local and global impact. The volume of volcanic ash from Novarupta was more than from all other historical Alaska eruptions combined. 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