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Rainbow River cone

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Earthquake

5 km
3 mi
Leaflet U.S. Department of the Interior | U.S. Geological Survey | Policies

Facts

  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1213m (3979ft)
  • Latitude: 58.49944
  • Longitude: -154.68177
  • Smithsonian VNum:
  • Pronunciation:
  • Nearby Towns:
    • Karluk 65 mi (104 km) SE
    • Kokhanok 65 mi (105 km) NW
    • Larsen Bay 71 mi (115 km) SE
    • King Salmon 72 mi (117 km) NW
    • Igiugig 72 mi (115 km) NW

    Distance from Anchorage: 250 mi (403 km)

Description

This feature is part of the Savonoski River Cluster of volcanoes, as defined by Hildreth and others (2004) [1] . From Hildreth and others (2004) [1] : "Rainbow River Cone (Peak 3980) is a small basaltic volcano (51.8-53% SiO2) perched on a basement ridge east of Rainbow River, 15 km NW of Mount Denison. The glacially sculpted cone, 1 km wide with 330 m relief, consists of radially dipping stacks of thin lavas and breccia sheets intercalated with scoria falls, well exposed on bounding cliffs, cut by numerous dikes, and gutted by a northerly cirque. Lavas and ejecta contain phenocrysts of plagioclase, orthopyroxene, clinopyroxene, olivine, and Fe-Ti oxides. An ice-scoured lava plateau (390 +/- 39 ka) extends 1 km SE from the cone."

Name Origin

"Rainbow River cone" is an informal name, after the nearby Rainbow River given by Hildreth and others (2004). The Rainbow River was named by R.H. Sargent's party in 1923 "because six rainbows were seen there" (Orth, 1971).

References Cited

[1] Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation, 2004

Hildreth, Wes, Fierstein, Judy, Siems, D. F., Budahn, J. R., and Ruiz, Joaquin, 2004, Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation: Contributions to Mineralogy and Petrology, v. 147, n. 3, p. 243-275.

Reported Activity

Modern Eruptions

1 Event Date(s)

Past Activity Legend:
Eruption
Questionable eruption
Non-eruptive activity


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Map References

References

Preliminary database of Quaternary vents in Alaska, 2014

Cameron, C.E., and Nye, C.J., 2014, Preliminary database of Quaternary vents in Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 153, 11 p., doi:10.14509/27357 .

Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation, 2004

Hildreth, Wes, Fierstein, Judy, Siems, D. F., Budahn, J. R., and Ruiz, Joaquin, 2004, Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation: Contributions to Mineralogy and Petrology, v. 147, n. 3, p. 243-275.
Hard Copy held by AVO at FBKS - CEC file cabinet

Mesozoic macrofossil locality map, checklists, and pre-Quaternary stratigraphic section of the Mt. Katmai and adjacent parts of the Afognak and Naknek quadrangles, Alaska Peninsula, Alaska, 1995

Miller, J.W., Elder, W.P., and Detterman, R.L., 1995, Mesozoic macrofossil locality map, checklists, and pre-Quaternary stratigraphic section of the Mt. Katmai and adjacent parts of the Afognak and Naknek quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 2021-G, 3 sheets. https://doi.org/10.3133/mf2021G

Before an eruption

Ashfall & Preparedness Information

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