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Global Volcanism Program | Image GVP-06261

People at the Arenal Volcano Observatory watch a S-flank pyroclastic flow on 23 January 1991. Pyroclastic flows occasionally descended the flanks throughout the long-lived eruption that began in 1968. Photo by McDiarmid, 1991 (courtesy of William Melson, Smithsonian Institution).

People at the Arenal Volcano Observatory watch a S-flank pyroclastic flow on 23 January 1991. Pyroclastic flows occasionally descended the flanks throughout the long-lived eruption that began in 1968.

Photo by McDiarmid, 1991 (courtesy of William Melson, Smithsonian Institution).

Keywords: volcano observatory | volcano monitoring | eruption | pyroclastic density current | PDC | pyroclastic flow


Arenal