The beautifully symmetrical Mount Cleveland stratovolcano forms the western half of the uninhabited Chuginadak Island in the eastern Aleutians, connected to the eastern half of the island by a narrow isthmus. It is one of the regions most active volcanoes, but at present has no seismic network. Monitoring of its activity is largely based on satellite observation.
No unusual activity has occurred at the volcano recently, but the lava dome in the summit crater continues to be active. Minor steaming can be occasionally seen and satellite data continue to detect a weak thermal anomaly. ...more
The Aviation Color Code of Cleveland remains at Orange and the Volcano Alert Level at Watch. [less]
A new lava dome is growing in the summit crater of the volcano. Therefore, the Alaska Volcano Observatory (AVO) raised the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. ...more
The dome was detected on recent satellite images and is thought to have started to grow after the end of the most recent series of explosions (which destroyed a previous dome) after 31 March this year. Slightly elevated surface temperatures could be detected on satellite data over the past weeks and the dome itself could be seen on satellite imagery on 15 April when it was a flat mound of lava about 10 m in diameter. On 23 April, its size had grown to approx. 45 m in diameter. AVO detected no seismic activity associated with the dome growth. [less]
The Alaska Volcano Observatory (AVO) lowered the alert level as no recent activity had been detected at the volcano: ...more
"No activity has been observed at Cleveland Volcano since an explosion was detected in seismic and infrasound data on March 24. Recent satellite images show no significant changes to the summit lava dome or crater since late February to early March. Based on seismic levels remaining low and no observations of continued activity, AVO is lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY." (AVO) [less]
A small explosion occurred at the volcano Friday (24 Mar 2017) morning at 08:15 AKST (16:15 UTC), the Alaska Volcano Observatory reported. The Aviation Color code was raised to Orange. ...more
The event was detected in both seismic and infrasound (pressure sensor) data. "This event was short lived and similar, if not smaller, than recent explosions at this volcano. Cloud cover to 30,000 feet above sea level is obscuring observations of the volcano by satellite views and no ash cloud has been observed. The ash cloud that was likely generated during this explosion has probably dissipated at this time and was likely not above 20,000 feet above sea level." (AVO) [less]
Landsat 8 satellite image of Cleveland on 19 Jan 2017
A new lava dome has been detected in the volcano's summit crater. The Alaska Volcano Observatory raised the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH: ...more
"Recent satellite observations indicate that a new lava dome has been extruded and is partially filling the summit crater at Cleveland volcano. The new dome is about 70 m (230 feet) in diameter and is similar in size to previous lava domes that have developed on the floor of the crater. When lava domes have developed within the summit crater, explosive activity has sometimes followed. The extrusion of the lava dome and the increased potential for explosive activity." (AVO) [less]
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