Global Volcanism Program | Image GVP-02111
A black lava flow advances across the floor of a maar on the W flank of North Pagan volcano on 23 May 1981. The flow originated from the summit crater of North Pagan (background) on 15 May. Most of the surface of a lagoon within the maar in the foreground is covered by black floating material from the explosive eruption on the 15th.
Photo by Norm Banks, 1981 (U.S. Geological Survey).