Ugashik-Peulik


Facts


  • Official Name:
  • Seismically Monitored: Yes
  • Color Code: GREEN
  • Alert Level: NORMAL
  • Elevation: 1474m (4835ft)
  • Latitude: 57.7503
  • Longitude: -156.37
  • Smithsonian VNum: 312130
  • 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
    • King Salmon 66 mi (106 km) NW
  • Subfeatures:
    • Ugashik caldera
    • Peulik
    • Mafic Knob 500

Description

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 Avalanche deposits representing an earlier sector collapse (Miller, unpublished data) underlie an area of 75 square km northwest of the volcano.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."

Name Origin

"Ugashik-Peulik volcanic center" is an informal name. The principal peaks in the center are Mount Peulik and Mount Ugashik.


References Cited

[1] Catalog of the historically active volcanoes of Alaska, 1998

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.

[2] 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.

Current Activity

No new updates for Ugashik-Peulik volcano since October 19, 2022, 3:05 pm.

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