Seguam description and statistics

Type:	Stratovolcano within caldera (?)
Most Recent Activity:	May 28, 1993
Seismically Monitored:	No
Distance:	1040 mi (1673 km) from Anchorage
Elevation:	3458 ft (1054 m)
Latitude:	52.316° N
Longitude:	172.51° W
Quadrangle:	Seguam
CAVW Number:	1101-18-
Sample Image:	More Seguam images ...
Location Map:
Pronunciation:	Sound file
Synonyms:	Siguam Siguam Goreli Giguan Genunam Island Gorely Island Saioogham Island Segouam Island Signam Island Tenounam Island
Associated Features:	Pyre Peak Wilcox Moundhill

From Miller and others (1998): "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 (Singer and others, 1992) 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 (Singer and others, 1992) 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 form 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 (Singer and others, 1992)."