Shishaldin volcano (Aleutian Islands, Alaska): alert level raised, likely new lava dome growing incrater
Saturday, Mar 29, 2014
The Alaska Volcano Observatory raised the alert level for the volcano to Aviation Color Code ORANGE and Alert Level WATCH: "Elevated surface temperatures were detected in satellite data beginning on March 18 and have persisted to the present time. ... [more]
Wednesday, Feb 26, 2014
AVO keeps the alert status at yellow, although no activity has been detected recently. [more]
Background:The beautifully symmetrical volcano of Shishaldin is the highest and one of the most active volcanoes of the Aleutian Islands. The 2857-m-high, glacier-covered volcano is the westernmost of three large stratovolcanoes along an E-W line in the eastern half of Unimak Island. The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." A steady steam plume rises from its small summit crater. Constructed atop an older glacially dissected volcano, Shishaldin is Holocene in age and largely basaltic in composition. Remnants of an older ancestral volcano are exposed on the west and NE sides at 1500-1800 m elevation. Shishaldin contains over two dozen pyroclastic cones on its NW flank, which is blanketed by massive aa lava flows. Frequent explosive activity, primarily consisting of strombolian ash eruptions from the small summit crater, but sometimes producing lava flows, has been recorded since the 18th century.
Smithsonian / GVP volcano information