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Seguam volcano, United States
The snow-dappled slopes of Pyre Peak are seen from near the western tip of Seguam Island. The elliptical, 11.5 x 24 km island contains two calderas, each with a Holocene central volcano.
A third Holocene cone lies at the eastern end of the island. Pyre Peak was constructed within the 3-km-wide westernmost caldera.
The 1054-m-high cone rises 1 km above the caldera floor and has been the source of most of the historical eruptions of Seguam volcano.
The elliptical, 11.5 x 24 km island of Seguam, lying between Amlia and Amukta Islands in the central Aleutians, contains two calderas with Holocene post-caldera cones.
Growth of the basaltic-to-rhyolitic Wilcox volcano on the east side of the island during the late Pleistocene was followed by edifice collapse and an associated ignimbrite eruption about 9000 years ago, leaving a horseshoe-shaped caldera open to the west, inside which a rhyolitic cone was constructed.
The 3 x 4 km wide westernmost caldera has a central scoria cone, Pyre Peak, which rises above the caldera rim and is the source of most of the historical eruptions of Seguam volcano.
A very young basaltic field surrounds Pyre Peak, and lava flows partially fill the caldera and reach the southern coast.
Older Holocene lava flows were erupted from vents within the eastern caldera, and a monogenetic Holocene cone forms Moundhill volcano on the eastern tip of the island.
PHOTO SOURCE:Photo by Steve Ebbert, 1996 (U.S. Fish and Wildlife Service).
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