Ingrisarak Mtn


  • Official Name: Ingrisarak Mountain
  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 111m (364ft)
  • Latitude: 61.51527
  • Longitude: -165.25638
  • Smithsonian VNum:
  • Nearby Towns:
    • Chevak 11 mi (18 km) NW
    • Paimiut 23 mi (37 km) NW
    • Scammon Bay 25 mi (40 km) NW
    • Hooper Bay 28 mi (45 km) NW
    • Newtok 45 mi (72 km) SE


From Wood and Kienle (1990) [1] : "Ingrisarak Mountain is a volcanic vent, composed entirely of red and black basalt scoria. It is 10 x 11 km in size." From Hoare and Condon, 1968 [2] : "Basalt (Qb) forms Ingrisarak Mountain, a volcanic vent, and also crops out near the eastern edge of the quadrangle on the flank of a similar vent in the adjoining Marshall quadrangle. Red and black fragments of basalt scoria are widespread in both areas, but no rock was found in place. The fragments have not moved far; they are angular, unweathered, and commonly show ropy flow features. The basalt consists of scattered phenocrysts of pyroxene and olivine in a fine-grained matrix. The basalt is assigned a Quaternary age because it is very fresh appearing and because the volcanic vents, although modified, are still physiographically expressed. Paleomagnetic measurements on oriented specimens from similar volcanic vents in the adjoning Marshall and Kwiguk quadrangles show that the basalt is normally magnetized. The physiographic expression and normal magnetic polarity suggests that the basalt was extruded during the latest (Brunhes) normal polarity epoch [3] [4] . Recent studies [5] [6] indicate that the Brunhes epoch began about 0.7 million years ago."

Name Origin

"Ingrisarak Mountain" is a Yup'ik name reported in 1951 by the U.S. Coast and Geodetic Survey (Orth, 1971).

References Cited

[1] 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.

[2] Geologic map of the Hooper Bay quadrangle, Alaska, 1968

Hoare, J. M., and Condon, W. H., 1968, Geologic map of the Hooper Bay quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 0523, unpaged, 1 sheet, scale 1:250,000.

[3] Geomagnetic polarity epochs-Sierra Nevada II, 1964

Cox, A., Doell, R.R., and Dalyrmple, G.B., 1964, Geomagnetci polarity epochs-Sierra Nevada II: Science, v. 143, p. 351-352.

[4] Quaternary paleomagnetic stratigraphy, 1965

Cox, A., Doell, R.R., and Dalrymple, G.B., 1965, Quaternary paleomagnetic stratigraphy, p. 817-839 in Wright, H.E., Jr., and Frey, D.G., eds., The Quaternary of the United States-A Review Volume for the VII Congress of the International Association for Quaternary Research: Princeton, New Jersy, Princeton University Press, 922 p.

[5] Potassium-argon age and paleomagnetism of the Bishop Tuff, California, 1965

Dalrymple, G.B., Cox, A., Doell, R.R. and Gromme, C.S., 1965, Potassium-argon age and paleomagnetism of the Bishop Tuff, California: Geological Society of America Bulletin, v. 76, n. 6, p. 665-673.

[6] Geomagnetic polarity epochs-Sierra Nevada data 3, 1966

Doell, R.R., Dalrymple, G.B., and Cox, A., 1966, Geomagnetic polarity epochs-Sierra Nevada data 3: Journal of Geophysical Research, v. 71, p. 531-541.

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