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Global Volcanism Program | Image GVP-03836

A steaming blocky lava flow from El Brujo, the westernmost of the Santiaguito vents, advances down a SW-flank valley in November 1973.  Santiaguito has grown during a series of several-year-long extrusive spurts separated by longer periods of slower extrusion lasting about a decade.  The fifth of Santiaguito's effusive cycles took place in 1972-75.  This eruptive cycle produced six lava flow units and a small lava dome.  It was unusual in that extrusion took place simultaneously from two vents at the western and eastern ends of Santiaguito. Photo by William Melson, 1973 (Smithsonian Institution).

A steaming blocky lava flow from El Brujo, the westernmost of the Santiaguito vents, advances down a SW-flank valley in November 1973. Santiaguito has grown during a series of several-year-long extrusive spurts separated by longer periods of slower extrusion lasting about a decade. The fifth of Santiaguito's effusive cycles took place in 1972-75. This eruptive cycle produced six lava flow units and a small lava dome. It was unusual in that extrusion took place simultaneously from two vents at the western and eastern ends of Santiaguito.

Photo by William Melson, 1973 (Smithsonian Institution).


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