Report on Cleveland (United States) — 22 August-28 August 2018
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 22 August-28 August 2018
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2018. Report on Cleveland (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 22 August-28 August 2018. Smithsonian Institution and US Geological Survey.
52.825°N, 169.944°W; summit elev. 1730 m
All times are local (unless otherwise noted)
Low-level unrest at Cleveland continued, though on 22 August AVO noted a pause in activity and lowered the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The report noted that elevated surface temperatures were identified in satellite images the previous day, suggestive of hot gas emissions from the summit crater vents.
Geologic Background. The beautifully symmetrical Mount Cleveland stratovolcano is situated at the western end of the uninhabited, dumbbell-shaped Chuginadak Island. It lies SE across Carlisle Pass strait from Carlisle volcano and NE across Chuginadak Pass strait from Herbert volcano. Joined to the rest of Chuginadak Island by a low isthmus, Cleveland is the highest of the Islands of the Four Mountains group and is one of the most active of the Aleutian Islands. The native name, Chuginadak, refers to the Aleut goddess of fire, who was thought to reside on the volcano. Numerous large lava flows descend the steep-sided flanks. It is possible that some 18th-to-19th century eruptions attributed to Carlisle should be ascribed to Cleveland (Miller et al., 1998). In 1944 Cleveland produced the only known fatality from an Aleutian eruption. Recent eruptions have been characterized by short-lived explosive ash emissions, at times accompanied by lava fountaining and lava flows down the flanks.