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Amak Island description and information


Official Name: Amak Island
Most Recent Activity:1796
Seismically Monitored: No
Elevation: 1683 ft (513 m)
Latitude: 55.41728° N
Longitude:163.14687° W
Quadrangle:Cold Bay
CAVW Number:311390
Pronunciation: Sound file
Nearby towns:Cold Bay 23 mi (37 km) SE
False Pass 40 mi (65 km) SW
King Cove 41 mi (66 km) SE
Belkofski 49 mi (79 km) SE
Anchorage 624 mi (1004 km) NE
From Wood and Kienle (1990) [1]: "Amak is a small (~1 cubic km), young volcano in the Bering Sea some 50 km north of Frosty Peak volcano at Cold Bay at the western tip of the Alaska Peninsula. It is unusual in its position, which is significantly north of the main Aleutian volcanic front; Bogoslof, some 250 km west, is the only other such Aleutian volcano. In overall character, Amak is much like a large volcanic dome except that it has a well-formed crater from which granular, blocky leveed flows have erupted in historic times. The earlier volcanism, perhaps some 4,000-5,000 yr ago, consisted mostly of thin (~3 m) platy to massive andesite. U-shaped valleys in the older series of flows indicate significant glaciation during the latest ice phase some 6,700 yr BP. The southern margin of Amak is a grassy, apparently wave-cut alluvial plain, which contains a flat-bottomed crater with a distinct upturned rim, which may be a maar. Amak lavas are similar in overall composition to those of the Cold Bay volcanic center except in a small but significant higher concentration of potash in Amak rocks."
Volcanoes of North America: United States and Canada, 1990
Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.

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