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Global Volcanism Program | Image GVP-07609

The SW part of Coatepeque caldera was formed about 57,000 years ago following the eruption of the roughly 16 cu km Congo biotite-bearing rhyolitic pumice-fall and pyroclastic-flow deposits.  Plinian and phreatoplinian eruptions took place through a lake that formed in the NE part of the caldera, which had formed during the larger Arce eruption about 72,000 years ago.  Post-caldera lava domes in the SW part of the caldera are seen in the middle ground.   Photo by Lee Siebert, 1999 (Smithsonian Institution).

The SW part of Coatepeque caldera was formed about 57,000 years ago following the eruption of the roughly 16 cu km Congo biotite-bearing rhyolitic pumice-fall and pyroclastic-flow deposits. Plinian and phreatoplinian eruptions took place through a lake that formed in the NE part of the caldera, which had formed during the larger Arce eruption about 72,000 years ago. Post-caldera lava domes in the SW part of the caldera are seen in the middle ground.

Photo by Lee Siebert, 1999 (Smithsonian Institution).


Coatepeque Caldera