Photography by Mangiwau / Getty Images. Composite volcanoes are also known as strato volcanoes. Death and property damage aren't the only consequences of composite volcanoes. Banded pumice colors the Valley of 10,000 Smokes in Katmai National Park in Southwest Alaska. No. Resuspended volcanic ash should be considered hazardous and could be harmful to aircraft and health. 1912 Novarupta eruption. Composite Volcanoes. Novarupta-Katmai Ash Resuspension. Because they eject matter and gases into the stratosphere, they affect weather and climate. Examples of composite volcanoes: Mount Fuji, Mount Shasta, Mount St. Helens, Mount Rainier. 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.) Moreover, they can range anywhere from 1-10 km in diameter. The explosive outburst at Novarupta (Alaska) in June 1912 was the 20th century's most voluminous volcanic eruption. 3. It was so powerful that it drained magma from under another volcano, Mount Katmai, six miles east, causing the summit of Katmai to collapse to form a caldera half a mile deep. - Composite volcanoes or stratovolcanoes: ... June 6, 1912 - Novarupta volcano erupts in Alaska, killing two people. The volume of volcanic ash from Novarupta was more than from all other historical Alaska eruptions combined. It is the largest volcanic eruption of the 20th century. The largest volcanic eruption of the 20th century occurred near Katmai volcano, a stratovolcano with a caldera near its summit. Katmai Volcano – Novarupta volcano vent. It is a very young volcano at this point, just over 100 years old. At the time of the eruption little was known about the area. (VEI 6) The eruption occurred from June 6-9, 1912. Particulates released by composite volcanoes yield colorful sunrises and sunsets. 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. On June 6th, 1912, Mount Katmai/Novarupta erupted on the Alaska mainland, just 250 miles (402 kilometers) southwest of Anchorage. A summer view of Katmai Pass extends to Novarupta volcano The eruption that transformed Southwest Alaska [By Andromeda Romano-Lax] A hundred years ago, on a hot and windless June day along the Katmai coast, a strange snow began to fall. Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. Semeru Volcano in Indonesia is an active stratovolcano. | + Join mailing list Oct. 3 , 2006: In June 1912, Novarupta—one of a chain of volcanoes on the Alaska Peninsula—erupted in what turned out to be the largest blast of the twentieth century. 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