Global Volcanism Program | Image GVP-04200
The 7-km-wide, lake-filled Apoyo caldera, seen here from the NW with Mombacho volcano in the background, is a large silicic volcanic center immediately SE of Masaya caldera. An early shield volcano constructed of basaltic-to-andesitic lava flows and small rhyodacitic lava domes collapsed following two major dacitic explosive eruptions about 23,000 years ago. Post-caldera ring-fracture eruptions formed the Granada cinder cones and La Joya collapse craters along fracture systems to the east of the caldera. The age of the latest activity is not known.
Photo by Alain Creusot-Eon, courtesy of Jaime Incer, 1968.