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Shishaldin volcano (Aleutian Islands, Alaska): alert level lowered

Fr, 27. Sep 2019, 21:54
21:54 PM | VON: T
Seismicity at the volcano has decreased over the past few weeks to levels slightly above background. In addition, satellite views of the volcano over the same period show a decrease in surface temperatures at the summit. Eruptive activity appears to have ended or paused.
Due to this decrease in activity, the Alaska Volcano Observatory is decreasing the Aviation Color Code for Shishaldin Volcano to YELLOW and the Alert Level to ADVISORY.

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Mi, 25. Sep 2019, 06:00
On 26 September AVO reported that seismicity at Shishaldin had decreased during the previous few weeks to levels slightly above background. Satellite images indicated decreased surface temperatures at the summit over the same period and showed collapse and slumping of the floor of the summit crater, suggesting a withdrawal of magma. Tiltmeter data suggested that the collapse may have occurred on 19 September. ... Read all
Mi, 18. Sep 2019, 06:00
AVO reported that during 18-24 September low-level tremor at Shishaldin continued to be recorded, along with elevated surface temperatures at the summit crater visible in satellite images when views were not obscured by clouds. The data suggested ongoing, slight growth of the scoria cone and lava flows within the summit crater. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. ... Read all
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