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Kaguyak Volcano, USA
The small, but spectacular 2.5-km-wide Kaguyak caldera,seen here from the west, is filled by a lake that lies more than 550 m below the caldera rim.
A post-caldera lava dome extends into the lake on the SW side and another dome forms a small island in the center of the lake.
The caldera is unglaciated and the voluminous caldera-forming deposits have been radiocarbon dated at at 5800 years ago.
A large pre-caldera lava dome forms the high point on the east caldera rim.
The broad valley of Big River descends to Shelikof Strait at the upper right.
The small, but spectacular 2.5-km-wide Kaguyak caldera in the NE part of Katmai National Park is filled by a >180-m-deep lake whose surface lies more than 550 m below the caldera rim.
Kaguyak volcano is only 901 m high, but rises directly from lowland areas near sea level south of the Big River.
Initially considered to be a typical stratovolcano truncated by a caldera, the pre-caldera edifice has been shown to consist of nine continuguous late-Pleistocene lava dome clusters, most of which lie east of the present caldera.
A large post-caldera lava dome extends into the lake on the SW side and another dome forms a small island in the center of the lake.
The youthful caldera is unglaciated, and distal tephras from the caldera-forming eruption have been radiocarbon dated at about 5800 years before present.
Voluminous dacitic pyroclastic-flow deposits surround the caldera and reached Shelikof Strait to the SE.
PHOTO SOURCE: Chris Nye, 1982 (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
NOTE: The information regarding Volcano on this page is re-published from other sources. No claims are made regarding the accuracy of Volcano information contained here. All suggestions for corrections of any errors about Volcano photos should be addressed to the copyright owner noted below the photo.
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This page was last modified 23-FEB-10
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