Mount Iliamna

About

Iliamna Volcano, or Mount Iliamna (Dena'ina: Ch’naqał’in, Alutiiq: Puyulek), is a glacier-covered stratovolcano in the largely volcanic Aleutian Range in southwest Alaska. Located in the Chigmit Mountain subrange in Lake Clark National Park and Preserve, the 10,016-foot (3, 053 m) volcano lies approximately 134 miles (215 km) southwest of Anchorage on the west side of lower Cook Inlet. It is the 25th most prominent peak in the United States. The volcano's glaciers have extensively altered its profile, cutting, deep and creating steep cliffs and cirques. A ridge extends 5 kilometres (3.1 mi) south from the main body of the mountain, with North Twin and South Twin peaks along its length. There is no summit crater, only a zone of fumaroles just south of the summit at the top of large collapse zone at the head of Red Glacier, which exposes a cross section of the mountain. Holocene eruptive activity from Iliamna is little known, but radiocarbon dating seems to indicate at least a few eruptions, all before the European settlement of Alaska. Prehistoric eruptions have been dated to 5050 and 2050 BCE (VEI-4), 450 BCE and 1650. Historically observed eruptions took place in 1867 (VEI-2) and 1876 (VEI-3), with unconfirmed eruptions in 1933, 1947, 1952 and 1953. Fumaroles located at about 8,990 feet (2, 740 m) elevation on the eastern flank produce nearly constant plumes of steam and minor a

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.