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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: dormant (1 out of 5)
West Crater volcano books
Typical eruption style: Explosive
West Crater volcano eruptions: ca. 8000 years ago
TimeMag. / DepthDistanceLocation
Tue, 22 Aug
Tue, 22 Aug 11:34 UTCM 1.6 / 10.5 km44 km- 3km WNW of Dollar Corner, Washington
Tue, 22 Aug 04:02 UTCM 0.8 / 10.8 km11 km- 26km NNW of Carson, Washington
Tue, 22 Aug 03:50 UTCM 0.6 / 3.4 km3 km- 37km NE of Amboy, Washington
Mon, 21 Aug
Mon, 21 Aug 10:36 UTCM 0.5 / 0.5 km1 km- 37km NNE of Amboy, Washington
Mon, 21 Aug 07:33 UTCM 1.0 / 9.3 km46 km- 14km W 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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