West Crater Volcanic Field | U.S. Geological Survey
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West Crater Volcanic Field
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West Crater Volcanic Field
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West Crater, a small andesitic lava dome with associated lava flows, is part of a Quaternary volcanic field southeast of Mount St. Helens in southern Washington.
Quick Facts
Location:
Washington, Skamania County
Latitude:
45.88° N
Longitude:
122.08° W
Elevation:
1,329 (m) 4,360 (f)
Volcano type:
Volcanic field
Composition:
Basalt to Andesite
Threat Potential:
Low/Very Low*
*based on the
National Volcano Early Warning System
Summary
Media
Sources/Usage: Public Domain.
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West Crater Volcanic Field.
It consists primarily of small basaltic and basaltic
andesite cinder
cones and shield volcanoes and is oriented along a northwest-to-southeast zone. This 20-km-wide (12 mi) 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.
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2018 update to the U.S. Geological Survey national volcanic threat assessment
2018 update to the U.S. Geological Survey national volcanic threat assessment
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Authors
John W. Ewert, Angela K. Diefenbach, David W. Ramsey
By
Volcano Hazards Program
Volcano Science Center
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Quick Facts
Location:
Washington, Skamania County
Latitude:
45.88° N
Longitude:
122.08° W
Elevation:
1,329 (m) 4,360 (f)
Volcano type:
Volcanic field
Composition:
Basalt to Andesite
Threat Potential:
Low/Very Low*
*based on the
National Volcano Early Warning System
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