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Trident volcano

Stratovolcano 1864 m / 6,115 ft
United States, Alaska Peninsula, 58.24°N / -155.1°W
Current status: dormant (1 out of 5) | Reports
Trident volcano books
Typical eruption style: unspecified
Trident volcano eruptions: 1974 
TimeMag. / DepthDistanceLocation
Wed, 19 Sep
Wed, 19 Sep 02:57 UTCM 0.3 / 1.6 km0 km- 95km SE of King Salmon, Alaska
Wed, 19 Sep 02:38 UTCM 0.4 / 4.3 km2 km- 101km NNW of Larsen Bay, Alaska
Tue, 18 Sep
Tue, 18 Sep 18:12 UTCM 2.0 / 0.8 km6 km- 98km NNW of Larsen Bay, Alaska
Tue, 18 Sep 09:29 UTCM 0.7 / 4.1 km10 km- 106km NNW of Larsen Bay, Alaska
Tue, 18 Sep 02:58 UTCM 0.7 / 5 km65 km- 98km ESE of King Salmon, Alaska
View all recent quakes

Background:

The Trident stratovolcano cluster was named for the three prominent peaks that were the most visible features at the summit prior to 1953. The andesitic-dacitic Trident group consists of four overlapping stratovolcanoes and numerous flank lava domes, including Falling Mountain and Mt. Cerberus on the far west flank. The summit complex of Trident is located 3-5 km SE of Novarupta volcano, and merges along a ridge to the NE with Katmai volcano. The three oldest Trident volcanoes are glaciated and Pleistocene in age, while the youngest, Southwest Trident, was formed during historical time. Eruptions at the Trident complex migrated stepwise with time from the NE to the SW. In 1953 a new lava dome began growing on the SW flank of Trident I volcano. A series of thick andesitic lava flows were erupted between 1953 and 1968, forming a cone with 400-800 m of local relief. Periodic explosions took place until 1974, and the current summit contains a 350-m-wide crater. Some of the distal lava flows from West Trident stratovolcano collapsed into the Novarupta vent during its 1912 eruption.
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Smithsonian / GVP volcano information


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