Nature
Mount Okmok, on Umnak Island in the Aleutian Islands, is a broad shield volcano whose ten-kilometer-wide caldera and long eruptive history make it one of the Aleutians’ largest and North America’s most active volcanoes. Formed along the Aleutian Volcanic Arc, it experienced two major caldera-forming eruptions in the Holocene, including a VEI 6 eruption in 43 BCE that has been linked to a volcanic winter affecting regions as distant as Egypt. Later eruptions, including one in 1817 that destroyed an Aleut village and another in 2008 that opened new vents, show its continuing danger to nearby waters, air routes, and scientific research.
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Nikolski, Alaska · United States
