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Report on Kanaga (United States) — 13 December-19 December 2023


Kanaga

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 13 December-19 December 2023
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2023. Report on Kanaga (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 13 December-19 December 2023. Smithsonian Institution and US Geological Survey.

Weekly Report (13 December-19 December 2023)

Kanaga

United States

51.923°N, 177.168°W; summit elev. 1307 m

All times are local (unless otherwise noted)


AVO reported that a small explosion at Kanaga was detected in local infrasound and seismic data at 2231 on 18 December, and was followed by elevated seismicity. No ash emissions were detected in partly cloudy satellite images. The next day the Volcano Alert Level was raised to Advisory (the second level on a four-level scale) and the Aviation Color Code was raised to Yellow (the second color on a four-color scale).

Geological Summary. Symmetrical Kanaga stratovolcano is situated within the Kanaton caldera at the northern tip of Kanaga Island. The caldera rim forms a 760-m-high arcuate ridge south and east of Kanaga; a lake occupies part of the SE caldera floor. The volume of subaerial dacitic tuff is smaller than would typically be associated with caldera collapse, and deposits of a massive submarine debris avalanche associated with edifice collapse extend nearly 30 km to the NNW. Several fresh lava flows from historical or late prehistorical time descend the flanks of Kanaga, in some cases to the sea. Historical eruptions, most of which are poorly documented, have been recorded since 1763. Kanaga is also noted petrologically for ultramafic inclusions within an outcrop of alkaline basalt SW of the volcano. Fumarolic activity occurs in a circular, 200-m-wide, 60-m-deep summit crater and produces vapor plumes sometimes seen on clear days from Adak, 50 km to the east.

Source: US Geological Survey Alaska Volcano Observatory (AVO)