Report on Cleveland (United States) — 4 April-10 April 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 4 April-10 April 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Cleveland (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 4 April-10 April 2001. Smithsonian Institution and US Geological Survey.
52.825°N, 169.944°W; summit elev. 1730 m
All times are local (unless otherwise noted)
The AVO reported that unrest continued at Cleveland. This was based on data from a seismic network 230 km E of the volcano that intermittently recorded low-level volcanic tremor over the last several weeks. Since the 19 March eruption there have been no reports of significant activity from either pilots, residents, or satellite remote sensors. The thermal anomaly previously observed in the vicinity of the volcano has been absent since 23 March. Based on current data and the volcano's historical activity, the AVO warned that additional ash-producing eruptions are possible at any time.
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.