The island itself is home to the active Makushin volcano, and more than half of the Aleutians’ 70 volcanoes have erupted in the last 250 years. The environment is also considered one of the ...

The Alaska Volcano Observatory has been monitoring ... Okmok - VEI 6 - ~100 BCE: Back out in the Aleutian Islands, Okmok is located on Unmak Island. From the air, the caldera at Okmok looks ...

Subduction of the Pacific Plate beneath the North American Plate creating the Aleutian trench and volcanic island arc (Credit: Alaska Volcano Observatory). Click image for a larger view.