West Crater

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 45.88°N
  • 122.08°W

  • 1329 m
    4359 ft

  • 321060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

There are no activity reports for West Crater.



 Available Weekly Reports

There are no Weekly Reports available for West Crater.

Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
5750 BCE (?) Unknown Confirmed 2 Radiocarbon (uncorrected) Bare Mountain
6110 BCE (?) Unknown Confirmed 2 Radiocarbon (uncorrected) West Crater, Hackamore Creek cone

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Barnett B, Korosec M A, 1986. Geothermal exploratory drilling by the State of Washington in 1985. Wash Geol Newsl, 14: 21-28.

Hammond P E, Pedersen S A, Hopkins K D, Aiken D, Harle D S, Danes Z F, Konicek D L, Stricklin C R, 1976. Geology and gravimetry of the Quaternary basaltic volcanic field, southern Cascade Range, Washington. In: {Proc 2nd United Nations Symp Devel Use Geotherm Resour, San Francisco}, Washington D C: U S Government Printing Office, 1: 397-405.

Wise W S, 1970. Cenozoic volcanism in the Cascade Mountains of southern Washington. Wash Dept Nat Resour Bull, 60: 1-45.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

West Crater, a small andesitic lava dome with associated lava flows, is part of a Quaternary volcanic field in southern Washington consisting primarily of small basaltic and basaltic andesite cinder cones and shield volcanoes, oriented along a NW-SE zone SE of Mount St. Helens. This 20-km-wide zone extends from Marble Mountain, north of Swift Reservoir, to south of Trout Creek Hill. The Pleistocene basaltic Trout Creek Hill shield volcano produced a lava flow about 340,000 years ago that traveled 20 km SE, temporarily damming the Columbia River. At least three vents in this field are of Holocene age--West Crater, a small cone at Hackamore Creek, and a phreatic crater at the summit of Bare Mountain. The latest eruptions at these locations have been dated at about 8000 years before present, and have included emplacement of an andesitic lava dome and associated lava flow at West Crater and formation of a phreatic explosion crater at Bare Mountain.