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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) | Reports
West Crater volcano books
Typical eruption style: Explosive
West Crater volcano eruptions: ca. 8000 years ago
TimeMag. / DepthDistanceLocation
Mon, 13 Aug
Mon, 13 Aug 18:01 UTCM 1.4 / 1.2 km73 kmExplosion - 16km WNW of Castle Rock, Washington
Sat, 11 Aug
Sat, 11 Aug 23:25 UTCM 0.4 / 9.2 km11 km- 36km SSE of Morton, Washington
Sat, 11 Aug 19:41 UTCM 2.1 / 1 km4 km WASHINGTON
Fri, 10 Aug
Fri, 10 Aug 21:21 UTCM 1.1 / 2.4 km4 km- 18km ESE of Packwood, Washington
Fri, 10 Aug 18:00 UTCM 2.5 / 4 km5 km 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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