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You are here: Home > Volcano Information > Ugashik-Peulik

Ugashik-Peulik description and information



Type:Stratovolcano with summit and flank domes, overlapping Ugashik caldera
Most Recent Activity:1852
Seismically Monitored: Yes
Color Code:GREEN
Alert Level:NORMAL
Elevation: 4836 ft (1474 m)
Latitude: 57.7503° N
Longitude:156.37° W
CAVW Number:312130
Pronunciation: Sound file
Associated Features:Ugashik caldera
Mafic Knob 500
Nearby towns:Kanatak 18 mi (29 km) SE
Ugashik 41 mi (67 km) SW
Pilot Point 47 mi (75 km) SW
Egegik 49 mi (79 km) NW
Anchorage 330 mi (531 km) NE
From Miller and others (1998) [1]: "Mount Peulik volcano, a small truncated stratovolcano with a basal diameter of about 10 km, is located just north of the main axis of the Aleutian Range near Becharof Lake on the Alaska Peninsula. The volcano lies west of the axis of a northeast-striking syncline [2] and is built upon Jurassic sedimentary rocks. The volcano partially overlaps the north flank of Ugashik caldera, a small circular structure about 5 km in diameter and of probable late Pleistocene age. A summit crater, about 1.5 km in diameter, has been breached on the west side and is occupied by a dome about 0.5 km in diameter. This dome, and possibly earlier predecessors, were the source the a thick deposit of block-and-ash flows that underlie about 40 square km of the western flank of the volcano. A smaller dome occurs on the east flank at an elevation of 1200 m and was the source of a small block-and-ash flow. Avalanche deposits representing an earlier sector collapse (Miller, unpublished data) underlie an area of 75 square km northwest of the volcano. Flows from flank eruptions of Peulik cover about 8 square km north of the volcano extending as far as Becharof Lake."
Catalog of the historically active volcanoes of Alaska, 1998
citation imageMiller, 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.
Download PDF title page PDF : 52
Download PDF intro and TOC PDF : 268 KB
Download PDF eastern part - Wrangell to Ukinrek Maars PDF : 972 KB
Download PDF central part - Chiginagak to Cleveland PDF : 2,463 KB
Download PDF western part - Carlisle to Kiska PDF : 956 KB
Download PDF references PDF : 43 KB

Geologic map of the Ugashik, Bristol Bay, and western part of Karluk quadrangle, Alaska, 1987
Detterman, R. L., Case, J. E., Wilson, F. H., and Yount, M. E., 1987, Geologic map of the Ugashik, Bristol Bay, and western part of Karluk quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1685, unpaged, 1 plate, scale 1:250,000.
Download link on DGGS website to PDF of the map

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