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Report on Shishaldin (United States) — 8 April-14 April 2020


Shishaldin

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 8 April-14 April 2020
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2020. Report on Shishaldin (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 8 April-14 April 2020. Smithsonian Institution and US Geological Survey.

Weekly Report (8 April-14 April 2020)

Shishaldin

United States

54.756°N, 163.97°W; summit elev. 2857 m

All times are local (unless otherwise noted)


AVO reported elevated seismicity at Shishaldin during 8-13 April characterized by occasional low-frequency earthquakes. Minor steaming from the summit crater was sometimes seen in satellite and webcam data. A small thermal anomaly was visible in satellite data during 8-9 April. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange.

Geological Summary. The symmetrical glacier-covered Shishaldin in the Aleutian Islands is the westernmost of three large stratovolcanoes in the eastern half of Unimak Island. The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." Constructed atop an older glacially dissected edifice, it is largely basaltic in composition. Remnants of an older edifice are exposed on the W and NE sides at 1,500-1,800 m elevation. There are over two dozen pyroclastic cones on its NW flank, which is covered 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. A steam plume often rises from the summit crater.

Source: US Geological Survey Alaska Volcano Observatory (AVO)