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Diaporama
Semisopochnoi volcan
Stratovolcano 1221 m / 4,006 ft
United States, Aleutian Islands, 51.93°N / 179.58°E
Condition actuelle: Activité petite ou avertissement éruption imminente (3 sur 5)
Semisopochnoi webcams / données en temps réel | Reports
Semisopochnoi livres
Eruptions du volcan Semisopochnoi:
1987 
Style éruptif tipique:
unspecified
Derniers séismes proches
Derniers images satellite

Sentinel hub | Landsat 8
 

Semisopochnoi volcano news & activity updates:

Semisopochnoi volcano (Alaska): new eruption, alert level raised to orange

samedi déc. 07, 2019 15:46 | AUTEUR : T

Seismic signal from Semisopochnoi volcano as recorded on Adak Island (image: AVO)
Seismic signal from Semisopochnoi volcano as recorded on Adak Island (image: AVO)
An eruption is probably occurring at the volcano. The Alaska Volcano Observatory (AVO) detected seismic signals of strong volcanic tremor, probably corresponding to the arrival of magma in the summit vent, but the nature of the eruption itself is unclear:
"The event started at 00:26 AKST / 09:26 UTC and has continued with and ongoing but weaker local seismic signal. Any volcanic ash emissions are most likely low-level.
The meteorological cloud deck has been around 10,000' (3000 m) asl over Semisopochnoi and no ash signals have been detected above this height. Nothing has been detected in lightning data." (AVO)
Actualités précédentes
jeudi, nov. 21, 2019
The U.S. Geological Survey Alaska Volcano Observatory (AVO) noted that weak seismicity levels continue. No eruptive activity has been detected by regional infrasound data, and no anomalous activity was observed in cloudy satellite data over the past day. [details]
lundi, sept. 23, 2019
Seismicity at the volcano has decreased over the past few weeks with no observations of seismic tremor since September 15. ... [details]
mercredi, août 07, 2019
AVO reported that during 31 July-6 August seismicity at the volcano remained elevated and was characterized by periods of weak, continuous tremor and discrete low-frequency earthquakes. Satellite images were mostly cloudy, though a possible steam plume was visible during 5-6 August. ... [details]
samedi, juil. 06, 2019
Yesterday, the Alaska Volcano Observatory raised the alert level of the volcano due to an increase in seismicity above background levels. ... [details]
jeudi, nov. 01, 2018
AVO reports that there have been no explosions in the last day, and only two the day before. The volcano remains highly restless and explosions could resume. [details]

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