Report on Cleveland (United States) — 2 August-8 August 2017
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 2 August-8 August 2017
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2017. Report on Cleveland (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 August-8 August 2017. Smithsonian Institution and US Geological Survey.
52.825°N, 169.944°W; summit elev. 1730 m
All times are local (unless otherwise noted)
On 7 August AVO stated that recent data suggested that the extrusion of lava at the bottom of Cleveland's summit crater may have slowed or paused during the previous week, though unrest continued. Elevated surface temperatures in the summit crater were identified in satellite data and vigorous steaming was recorded by the webcam during 7-8 August. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Geologic Background. The beautifully symmetrical Mount Cleveland stratovolcano is situated at the western end of the uninhabited 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 it 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.