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Trident Volcano

Updated: 28 mars. 2024 09:45 GMT -
Stratovolcano 1864 m / 6,115 ft
United States, Alaska Peninsula, 58.24°N / -155.1°W
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 11 janv. 2024 (alert level diminished to Green)

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Style éruptif tipique: unspecified
Eruptions du volcan Trident: 1974 

Derniers séismes proches

HeureMag. / ProfondeurDistance / Lieu
20 mars 09:54 (Anchorage)
20 mars. 17:54 GMT
1.2

3.5 km
15 km à l'ouest États-Unis, 179 km à l'ouest de Kodiak, Kodiak Island, Alaska Info
lundi, 18 mars 2024 GMT (1 séisme)
18 mars 05:31 (Anchorage)
18 mars. 13:31 GMT
1.2

4 km
26 km au nord-est 94 km NNW of Karluk, Alaska Info
jeudi, 28 mars 2024 GMT (1 séisme)
28 mars 01:24 (Anchorage)
28 mars. 09:24 GMT
1.0

11 km
28 km au sud-ouest 85 km NW of Karluk, Alaska Info
lundi, 18 mars 2024 GMT (1 séisme)
17 mars 23:35 (Anchorage)
18 mars. 07:35 GMT
0.7

2.2 km
9.8 km à l'est 82 km NNW of Karluk, Alaska Info
mardi, 19 mars 2024 GMT (2 séismes)
19 mars 01:08 (Anchorage)
19 mars. 09:08 GMT
0.6

1.1 km
14 km au sud-ouest 85 km NW of Karluk, Alaska Info
18 mars 17:47 (Anchorage)
19 mars. 01:47 GMT
0.6

0 km
14 km au sud-ouest 86 km NW of Karluk, Alaska Info

Introduction

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
Actualités
jeu., 11 janv. 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
mer., 26 juil. 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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