Chetaslina Vent Zanetti, Mt North Crater East Crater West Crater Wrangell Caldera
Nearby towns:
Kenny Lake 35 mi (57 km) SW Chitina 36 mi (59 km) SW Willow Creek 41 mi (66 km) SW Copper Center 42 mi (67 km) SW Anchorage 201 mi (323 km) SW
DESCRIPTION
From Miller and others (1998) [1]: "Mount Wrangell is a large andesitic shield volcano with a volume of about 900 cubic kilometers (Nye, 1983). Its top is capped by a 4 by 6 km, ice-filled summit caldera whose depth may exceed 1 km [2]. The caldera is apparently of non-explosive origin [3] formed in response to the withdrawal of magma from high-level reservoirs beneath the summit area. Three small (<1 km in diameter) post-caldera craters, all geothermally active, occur along the west and north margin of the caldera. Mt. Zanetti (3965 m) a large (450 m high) steep-sided, relatively undissected cinder-spatter cone occurs high on the northwest flank of the shield and may be the source of some lava flows. Lavas on the southwest flank have flowed as much as 58 km from their source despite being phenocryst-rich andesite, a mobility attributed to a very high eruption rate [4]."
Glacier-volcano interactions on Mt. Wrangell, Alaska, 1979 Benson, C. S., and Motyka, R. J., 1979, Glacier-volcano interactions on Mt. Wrangell, Alaska: University of Alaska Geophysical Institute Annual Report 1977-78, p. 1-25.
[3]
Shield volcanoes in the Wrangell Mountains, Alaska, 1984 Richter, D. H., Smith, J. G., Ratte, J. C., and Leeman, W. P., 1984, Shield volcanoes in the Wrangell Mountains, Alaska: in Reed, K. M. and Bartsch-Winkler, Susan, (eds.), The United States Geological Survey in Alaska: accomplishments during 1982, U.S. Geological Survey Circular C 0939, p. 71-75.
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Miller, 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.
Nye, C. J., 1983, Petrology and geochemistry of Okmok and Wrangell volcanoes, Alaska: University of California, Santa Cruz Ph.D. dissertation, 208 p.
