Alaska Volcano Observatory

Ground view of the pond outlet on the north flank of Lower Klawasi mud volcano summit pond in the Copper River Basin west of Mt. Drum, in the Wrangell Mountains near Glennallen, AK. The yellow box is a multigas sensor measuring the composition of gases released from the pond. The tree stump shows that, at some time in the distant past, the summit of Lower Klawasi was lower and forested. A dramatic increase in mud output then buried the summit and flanks beneath several meters (yards) of mud, its approximate thickness illustrated by the height of the outlet gully walls.