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The Arenal Observatory Lodge was constructed at the site of a joint OVSICORI-UNA/Smithsonian Institution volcano observatory established on the SSW flank. The observatory building itself, out of view to the right, was used for seismic monitoring and visual documentation of the frequent eruptive activity from Arenal. This photo was taken in 1992.

Photo by William Melson, 1992 (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). This is the OSIVAM observatory that monitors seismic and volcanic activity at Arenal and Miravalles volcanoes. The observatory is located in Quebrada Grande, 14 km from the town of Tilarán and west of Lake Arenal.

Photo by Guillermo Alvarado (Instituto Costarricense de Electricidad).