Alaska Volcano Observatory

View of the southwestern caldera from near the summit of Mt. Finch. The ridge in the middle distance is the southwestern caldera wall. On the far left is the southern outflow canyon, the only drainage flowing out of the caldera. Light colored deposits are hydrothermally altered pumice and lithics from an eruption of Turquoise Cone (to the right). Westdahl volcano is in the background (far right).