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Global Volcanism Program | Image GVP-03994

Large-scale collapse of the summit of Pacaya volcano sometime between about 1550 and 600 years ago created a large horseshoe-shaped caldera.  Collapse was followed by a large explosive eruption that produced widespread pyroclastic surges.  This roughly 150-m-high section of the NW caldera wall exposes light-colored lava flows overlying pyroclastic deposits of the pre-collapse volcano.  Subsequent eruptions have constructed a new cone within the caldera.  Lava flows from MacKenney cone (out of view to the right) are slowly filling in the caldera moat. Photo by Lee Siebert, 1988 (Smithsonian Institution).

Large-scale collapse of the summit of Pacaya volcano sometime between about 1550 and 600 years ago created a large horseshoe-shaped caldera. Collapse was followed by a large explosive eruption that produced widespread pyroclastic surges. This roughly 150-m-high section of the NW caldera wall exposes light-colored lava flows overlying pyroclastic deposits of the pre-collapse volcano. Subsequent eruptions have constructed a new cone within the caldera. Lava flows from MacKenney cone (out of view to the right) are slowly filling in the caldera moat.

Photo by Lee Siebert, 1988 (Smithsonian Institution).


Pacaya