Report on Cleveland (United States) — 5 October-11 October 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 October-11 October 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Cleveland (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 5 October-11 October 2005. Smithsonian Institution and US Geological Survey.
52.825°N, 169.944°W; summit elev. 1730 m
All times are local (unless otherwise noted)
AVO staff recorded a small ash cloud emitted from Cleveland on satellite imagery on the morning of 7 October. Based on satellite data, a small eruption occurred at Cleveland sometime before 0300. The ash cloud was located E of the volcano and ~150 km ESE of Dutch Harbor at 0900. AVO, in consultation with the National Weather Service, estimated that the top of the ash cloud reached no more than 4.6 km (15,000 ft) a.s.l. The ash cloud dissipated and was not detected on satellite imagery after 1000. The Concern Color Code at Cleveland was Orange on 7 October. During 7-10 October, there were no new observations of eruptive activity at Cleveland on satellite imagery, by pilots, or ground-based observers, so the Concern Color Code was reduced to Yellow.
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.