Global Volcanism Program | Image GVP-04058
The SW wall of Ilopango caldera rises about 500 m above the surface of the caldera lake. Punta La Peninsula (center) on the western side of the caldera extends a kilometer into the lake. The high wall on the southern side of the lake is a fault scarp in southward-dipping rocks of the Pliocene Balsamo formation. The scenic lake is a popular resort destination from the capital city of San Salvador, and the shores of the lake are dotted with resorts and vacation homes.
Photo by Kristal Dorion, 1994 (U.S. Geological Survey).