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West Crater volcano

volcanic field 1329 m / 4,360 ft
Washington, USA (mainland exept Alaska), 45.88°N / -122.08°W
Current status: normal or dormant (1 out of 5) | Reports
West Crater volcano books
Typical eruption style: Explosive
West Crater volcano eruptions: ca. 8000 years ago
TimeMag. / DepthDistanceLocation
Sat, 15 Dec
Sat, 15 Dec 10:08 UTCM 1.8 / 7.5 km15 km- 10km E of Yacolt, Washington
Fri, 14 Dec
Fri, 14 Dec 21:40 UTCM 1.4 / 0.1 km18 km- 22km NNE of Amboy, Washington
Thu, 13 Dec
Thu, 13 Dec 18:01 UTCM 1.2 / 7.8 km40 km- 1km WSW of Morton, Washington
Wed, 12 Dec
Wed, 12 Dec 21:47 UTCM 1.8 / 9 km18 km- 26km ESE of Eatonville, Washington
Wed, 12 Dec 13:31 UTCM 0.6 / 6.7 km25 km- 16km S of Morton, Washington
View all recent quakes
West Crater volcano is a small andesitic lava dome with lava flows in southern Washington, belonging to a volcanic field extending from Marble Mountain, north of Swift Reservoir, to south of Trout Creek Hill. The field consists mainly of small basaltic and basaltic andesite cinder cones and small shield volcanoes, oriented along a NW-SE zone SE of Mount St. Helens.
The most recent activity occurred about 8,000 years ago and formed the West Crater lava dome, a small cone at Hackamore Creek, and a phreatic crater at the summit of Bare Mountain.
The older, basaltic Trout Creek Hill shield volcano erupted a lava flow about 340,000 years ago that traveled 20 km SE and temporarily dammed the Columbia River.

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