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Trident Volcano

Updated: Mar 28, 2024 17:28 GMT -
Stratovolcano 1864 m / 6,115 ft
United States, Alaska Peninsula, 58.24°N / -155.1°W
Current status: normal or dormant (1 out of 5)
Last update: 11 Jan 2024 (alert level diminished to Green)

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Typical eruption style: unspecified
Trident volcano eruptions: 1974 

Latest nearby earthquakes

TimeMag. / DepthDistance / Location
Mar 20, 09:54 am (Anchorage)
Mar 20, 17:54 GMT
1.2

3.5 km
15 km (9.6 mi) to the W 86 km NW of Karluk, Alaska Info
Monday, March 18, 2024 GMT (1 quake)
Mar 18, 05:31 am (Anchorage)
Mar 18, 13:31 GMT
1.2

4 km
26 km (16 mi) to the NE 94 km NNW of Karluk, Alaska Info
Thursday, March 28, 2024 GMT (1 quake)
Mar 28, 01:24 am (Anchorage)
Mar 28, 09:24 GMT
1.0

11 km
28 km (17 mi) to the SW Lake and Peninsula, United States, 116 mi west of Kodiak, Kodiak Island Borough, Alaska Info
Monday, March 18, 2024 GMT (1 quake)
Mar 17, 11:35 pm (Anchorage)
Mar 18, 07:35 GMT
0.7

2.2 km
9.8 km (6.1 mi) to the E 82 km NNW of Karluk, Alaska Info
Tuesday, March 19, 2024 GMT (2 quakes)
Mar 19, 01:08 am (Anchorage)
Mar 19, 09:08 GMT
0.6

1.1 km
14 km (8.6 mi) to the SW 85 km NW of Karluk, Alaska Info
Mar 18, 05:47 pm (Anchorage)
Mar 19, 01:47 GMT
0.6

0 km
14 km (9 mi) to the SW 86 km NW of Karluk, Alaska Info

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

Latest satellite images

trident satellite image sat1trident satellite image sat2
Thu, 11 Jan 2024, 07:35

Trident volcano (Alaska Peninsula): alert level diminished to Green

The activity of the volcano has waned over the past month. ... Read all
Wed, 26 Jul 2023, 08:46

Trident volcano (Alaska Peninsula): seismic swarm continues, uplift has reached 5 cm, likelihood of eruption increases

Katmai volcanic cluster (image: AVO)
The Alaska Volcano Observatory (AVO) reported that a significant increase in low-frequency earthquakes (both shallow and deep-level earthquakes) started to develop in the region of Katmai volcanic cluster since May this year. ... Read all

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