Report on Cleveland (United States) — 25 October-31 October 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 October-31 October 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Cleveland (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 25 October-31 October 2006. Smithsonian Institution and US Geological Survey.
52.825°N, 169.944°W; summit elev. 1730 m
All times are local (unless otherwise noted)
AVO raised the Alert Level for Cleveland from Advisory to Watch on 28 October based on pilot reports of an ash plume. Satellite imagery confirmed the presence of a plume drifting ENE at an altitude estimated at 6.1 km (20,000 ft) a.s.l. A pilot reported that the altitude of the plume was in excess of 9.1 km (30,000 ft) a.s.l. On 30 October, the Alert Level was lowered back to Advisory because of no further evidence of activity.
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.