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Trident volcan

Mise à jour: 7 déc.. 2022 20:31 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: 20 oct. 2022 (alert status lowered to Green)

Montrer carte interactive
Style éruptif tipique: unspecified
Eruptions du volcan Trident: 1974 

Derniers séismes proches

HeureMag. / ProfondeurDistance/Lieu
lundi, 5 décembre 2022 GMT (1 séisme)
5 déc. 2022 06:17 (GMT -9) (5 déc.. 2022 15:17 GMT)

1.3 km
10.4 km (6.5 mi)
99 km au sud-est de King Salmon, Arrondissement de Bristol Bay, Alaska, États-Unis
vendredi, 2 décembre 2022 GMT (1 séisme)
1 déc. 2022 20:47 (GMT -9) (2 déc.. 2022 05:47 GMT)

51 km
14 km (8.7 mi)
94 km au sud-est de King Salmon, Arrondissement de Bristol Bay, Alaska, États-Unis
mercredi, 30 novembre 2022 GMT (2 séismes)
29 nov. 2022 21:02 (GMT -9) (30 nov.. 2022 06:02 GMT)
4.3 km (2.7 mi)
86 km au nord-ouest de Karluk, Arrondissement de Kodiak Island, Alaska, États-Unis
29 nov. 2022 20:58 (GMT -9) (30 nov.. 2022 05:58 GMT)
3.1 km (1.9 mi)
85 km au nord-ouest de Karluk, Arrondissement de Kodiak Island, Alaska, États-Unis
dimanche, 27 novembre 2022 GMT (1 séisme)
27 nov. 2022 13:11 (GMT -9) (27 nov.. 2022 22:11 GMT)

11 km
40 km (25 mi)
47 km au nord de Karluk, Arrondissement de Kodiak Island, Alaska, États-Unis


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.
Smithsonian / GVP volcano information

See also: Sentinel hub | Landsat 8 | NASA FIRMS
jeu., 20 oct. 2022, 04:06

Trident volcano (Alaska Peninsula): alert status lowered to Green

Trident volcano (image: Alaska Volcano Observatory)
A decision has been made by the Alaska Volcano Observatory (AVO) to reduce the Volcanic Alert Level for the volcano to "Green". ... Read all
mer., 5 oct. 2022, 14:00

Trident volcano (Alaska) - Smithsonian / USGS Weekly Volcanic Activity Report for 28 September-4 October 2022 (New Activity / Unrest)

AVO raised the Aviation Color Code for Trident to Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level to Advisory (the second lowest level on a four-level scale) on 29 September due to an ongoing seismic swarm. The swarm began on 24 August and within about four days the seismic network began detecting episodes of weak seismic tremor and low frequency earthquakes. The events were initially located at depths around 25 km, but then they progressively shallowed to around 5 km by 28 August. ... Read all
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