Global Volcanism Program | Image GVP-10099
Volcán Ajusco, the highest peak of the Chichinautzin volcanic field, is seen here from the summit of the Xitle scoria cone to the NE. The Pliocene-Pleistocene Ajusco consists of lava domes surrounded by block-and-ash flows. During the Pleistocene the NE flank collapsed, producing a debris avalanche that traveled 16 km. Late-stage eruptions produced more mafic lava flows from flank vents, marking a transition to the monogenetic volcanism of the Chichinautzin volcanic field.
Photo by Lee Siebert, 1998 (Smithsonian Institution).