An extensive volcanic field of fresh-looking basaltic cinder cones and barren lava flows near Lake Güija, which straddles the border between El Salvador and Guatemala, is named after its largest feature, Volcán de San Diego. A large basaltic lava flow from the San Diego cinder cone dammed the drainage and was responsible for the formation of Lake Güija. Volcanism is concentrated in two areas near Lake Güija--an area of volcanic cones including San Diego E of the lake, and an area of small cones N of the lake near the Guatemalan border, N of the Río Ostua. None of the eruptions have been dated, but Williams and McBirney (1955) estimated that the latest eruption occurred within the past few thousand years. Quaternary volcanic rocks are also located across Lake Güija in Guatemala.
An extensive volcanic field of fresh basaltic cinder cones and barren lava flows near Lake Güija is named after its largest feature, 781-m-high Volcán de San Diego (upper right). A large basaltic lava flow from the San Diego cinder cone dammed the drainage and was responsible for the formation of 12-km-long Lake Güija, which lies mostly in El Salvador, but extends across the border into Guatemala. Cerro el Tule cinder cone in the center of the photo lies near the eastern shore of the lake, due south of Volcán San Diego.
Photo by Giuseppina Kysar, 1999 (Smithsonian Institution).
Last updated 2019-08-04 00:28:03