Shishaldin, Alaska : low-level seismic tremor .

Shishaldin, Alaska :  low-level seismic tremor .

Nearly continuous, low-level seismic tremor, as well as small discrete events, continued during the past 24 hours at Shishaldin, and are present at levels above background for the volcano. No activity was observed in satellite images.

Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 16 km (10 mi). A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 24 confirmed eruptions since 1775. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level.

January 31, 2016. Shishaldin, Alaska :

54°45’19 » N 163°58’16 » W,
Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Source : AVO

Photo : Werner, Cindy

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