AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
About Alaska's Volcanoes | Hazards from Alaska's Volcanoes | Map & Alphabetical List | Interactive Map | Eruption Search | Volcano Search | Wide Bay cone 
You are here: Home > Volcano Information > Wide Bay cone

Wide Bay cone description and information


Most Recent Activity:
Seismically Monitored: No
Elevation: 2100 ft (640 m)
Latitude: 53.9611° N
Longitude:166.615° W
CAVW Number:
Pronunciation: Sound file
Nearby towns:Unalaska 7 mi (11 km) SE
Akutan 36 mi (58 km) NE
Nikolski 117 mi (188 km) SW
False Pass 143 mi (230 km) NE
Anchorage 793 mi (1276 km) NE
From Miller and others (1998) [1]: "Wide Bay cone, a small symmetric cone with an oval summit crater, occupies the northwest edge of Unalaska Bay." Wide Bay cone is Holocene in age, and is considered to represent a magmatic system separate from that of Makushin Volcano (Nye, personal commun., 2007). From McConnell and others (1998) [2]: "Basaltic tephra and lava flows form the monogenetic Wide Bay Cone near Eider Point, the easternmost volcano of the Makushin volcanic field. Both tephra and lava flows are dominated by up to 20 vol.% of large, single phenocrysts and glomerocrysts of clinopyroxene. The clinopyroxene is zoned and may reach 4 mm in diameter. Additional important phenocryst phases include plagioclase (15 to 19 vol.%), olivine (1 to 5 vol.%), and minor magnetite in a microlite-rich, sideromelane groundmass. Lowermost flows at the base of the cone are glacially striated although the cone remains well shaped with the summit vent depression preserved."
Catalog of the historically active volcanoes of Alaska, 1998
citation imageMiller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report 98-0582, 104 p.
Download PDF title page PDF : 52
Download PDF intro and TOC PDF : 268 KB
Download PDF eastern part - Wrangell to Ukinrek Maars PDF : 972 KB
Download PDF central part - Chiginagak to Cleveland PDF : 2,463 KB
Download PDF western part - Carlisle to Kiska PDF : 956 KB
Download PDF references PDF : 43 KB

Geologic map of the Makushin volcanic field, Unalaska Island, Alaska, 1998
McConnell, V. S., Beget, J. E., Roach, A. L., Bean, K. W., and Nye, C. J., 1998, Geologic map of the Makushin volcanic field, Unalaska Island, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 97-20, unpaged, 2 sheets, scale 1:63,360.
Download website with links to map sheets and report in PDF format

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/volcanoes/volcinfo.php
Page modified: September 29, 2020 12:19
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.