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.
Vue claire sur le lac de lave dans le Marum (cratère ouest). (Photo: Tom Pfeiffer)
Le lac de lave dans le cratère ouest du Marum (Photo: Tom Pfeiffer)
Lac de lave à l'intérieur du cratère de Gap ouest du volcan Kilauea. La croûte entière couvrant le lac a juste été renversée, exposant l'intérieur éclatant de red hot. ha...
Le complexe du Marum cratère et ses puits de cratères environnants: Mbwelesu (l), fosse ouest Marum avec le lac de lave (al), de fumer Niri Mbwelesu (c), et Niri Mbwelesu...
View onto the western crater wall of the 2002 flank cone, the SE crater behind in the background. (Photo: Tom Pfeiffer)
Le lac de lave de du Marum cratère de l'Ouest et le tabagisme Niri Mbwelesu cratère contenant une autre aération active à droite. (Photo: Tom Pfeiffer)
