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

Seguam Island description and information

SEGUAM LINKS

SAMPLES
LOCATION
FACTS
Official Name: Seguam Island
Type:Stratovolcano within caldera (?)
Most Recent Activity:May 28, 1993
Seismically Monitored: No
Elevation: 3458 ft (1054 m)
Latitude: 52.316° N
Longitude:172.51° W
Quadrangle:Seguam
CAVW Number:311180
Pronunciation: Sound file
Associated Features:Pyre Peak
Wilcox
Moundhill
Nearby towns:Attu Station 53 mi (85 km) NW
Atka 72 mi (116 km) SW
Shemya Station 73 mi (117 km) NW
Nikolski 158 mi (255 km) NE
Anchorage 1045 mi (1681 km) NE
DESCRIPTION
From Miller and others (1998) [1]: "Seguam Island consists of the remnants of two late Quaternary calderas. Holocene volcanic cones occur in both of the calderas and a third Holocene cone lies at the east end of the island. Pyre Peak, commonly referred to as Sequam volcano, highest of the young cones, dominates the western half of the island and occupies the center of the western caldera [2] that is defined by remnants of a semi-circular ridge about 3 km in original diameter and about 700 m high. A Holocene basalt field surrounds Pyre Peak [2] extending down to shoreline. This general area has been the site of most if not all historical volcanic activity. Late Quaternary lavas and pyroclastic rocks ranging in age from 1.1 Ma to 0.03 Ma underlie the basalt. The two Holocene cones to the east are surrounded by andesite and dacite lava flows with well preserved constructional features [2]."
REFERENCES CITED
[1]
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 OF 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

[2]
Mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc: closed-system fractional crystallization of a basalt to rhyodacite eruptive suite, 1992
citation imageSinger, B. S., Myers, J. D., and Frost, C. D., 1992, Mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc: closed-system fractional crystallization of a basalt to rhyodacite eruptive suite: Contributions to Mineralogy and Petrology, v. 110, p. 87-112.

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www2.avo.alaska.edu/volcanoes/volcinfo.php
Page modified: June 12, 2014 07:20
Contact Information: AVO Web Team

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