Global Volcanism Program | Image GVP-03708
The new 1991 block lava flow advances down the steep upper SW flank at about 3600 m elevation. Aerial observations revealed prominent lateral levees, crescentic push-up ridges near the flow front, elongated mid-channel levees, and a lava channel within which most of the flow was advancing. The flow was about 100 m wide, 30 m thick, and 300 m long at the time of this April 20, 1991 photograph. Renewed lava extrusion took place following the partial collapse of the summit dome on April 16. Nevado de Colima is in the background.
Photo by Juan Manuel Espíndola, 1991 (Universidad Nacional Autónoma de México).