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Trident volcano (Alaska Peninsula): seismic swarm

Thu, 15 Sep 2022, 10:22
10:22 AM | BY: MARTIN
Trident volcano (image: Smithsonian/Global Volcanism Program)
Trident volcano (image: Smithsonian/Global Volcanism Program)
The Alaska Volcano Observatory (AVO) registered a swarm of earthquakes beneath the volcano that started on 24 August and is still continuing.
Quakes were located at deep levels firstly, at about 25 km depth, but have become progressively shallower up to approx. 7-to-5 and even 0 km depth since 28 August until now.
Earthquake magnitudes have ranged between M 0.7 and M 1.9.
At a swarm peak episode, dozen of quakes have been occurring daily beneath the edifice, but over the past week, its frequency has decreased to a couple per day.
The elevated seismic activity may indicate that increased fluid movements of gas, water and possibly magma shift under the surface.
A continuing shallow-level seismicity is expected including other signs of unrest, such as gas, water vapor emissions, elevated surface temperatures or ground deformation.
Source: Alaska Volcano Observatory volcano activity update 15 September 2022
Trident volcano
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) Trident volcano eruptions:
1974 
Typical eruption style
unspecified
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