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Global Volcanism Program | Image GVP-07808

The steep-sided walls of the 1902 explosion crater at Santa María expose a sequence of alternating thin (1-10 m) light-colored lava flows and brownish-colored block-and-ash deposits.  Growth of the composite cone involved the extrusion of basaltic-andesite lava flows, mostly from the summit vent.  Andesitic lava, the most silicic of those forming the cone, caps the summit.   Photo by Bill Rose, 1974 (Michigan Technological University).

The steep-sided walls of the 1902 explosion crater at Santa María expose a sequence of alternating thin (1-10 m) light-colored lava flows and brownish-colored block-and-ash deposits. Growth of the composite cone involved the extrusion of basaltic-andesite lava flows, mostly from the summit vent. Andesitic lava, the most silicic of those forming the cone, caps the summit.

Photo by Bill Rose, 1974 (Michigan Technological University).


Santa María