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Emmons Lake Volcano | John Seach
Alaska
55.33 N, 162.07 W
summit elevation 1465 m
Caldera
Emmons Lake is located in the Alaskan peninsula, 40 km east of Cold Bay, about 34 km northeast of King Cove.
Emmons Lake Caldera
The volcano contains an 18 x 11 km caldera which is one of the largest of the Aleutian volcanic arc. The caldera contains three stratovolcanoes - Mt Emmons, Mt Hague, and Double Crater. The caldera is breached on the north and south sides with lava flows extending through the gaps. The north side breach is 3 km wide and it contains headwaters of the upper Cathedral River. The south side breach is 9 km wide and drains Emmons Lake.
Mount Emmons
(55.341 N, 162.074 W, summit elevation 1325 m)
The stratovolcano is mainly andesite, with some basaltic andesite and low-silica dacite lavas. There have been no historical eruptions at the volcano.
Mount Hague
( 55.378 N, 161.977, summit elevation 1540 m)
The volcano is the largest of the vents with a volume of 5 cubic km. Mount Hague consists of a twin-peaked andesitic stratovolcano, 5 km wide at the base, and about 750 m high. Two intersecting circular craters, about 400 m in diameter, form the summit. The southern crater is 250 m deep and contains a steaming, acidic ephemeral lake. The lake periodically drains, revealing a fumarole field on the crater floor.
Double Crater
(55.392 N, 161.949 W, summit elevation 1357 m)
The crater is located 2.5 km NE of Mount Hague. It consists of of two small craters at the top of a snow and ice covered stratocone.
Steam emissions were observed at Mount Hague in 1990 and 1991. A white plume was observed 350-500 m above the SW side of the summit crater.
In 1940's and 1950's, six large fumaroles and many other small ones were observed in a steep gully on the SW side of Mt. Hague. A large fumarolic was found on the S side of the volcano.
Emmons Lake Volcano Eruptions
Steam emissions in 1990 and 1991.