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Fallout material from Turrialba volcano, Friday 14th, 2011
From: Eliecer Duarte <eduarte@xxxxxxxxx>
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Rockslides triggered fine fallout material: Turrialba Volcano, Costa Rica.
Settlers living at the base of Turrialba volcano reported fine fallout on Friday, 14, 2011 (around 3pm, 21GMT). Due to thick cloudiness, rain and wind fieldwork was postponed.
A visit, by OVSICORI staff, to the summit and surroundings (Tuesday 18th) showed rockslides from both sides of the vent opened exactly one year ago, when several phreatic eruptions took place. A singular hanging horizontal cave (lateral explosion vent ?) was formed and produced a small terrace topped with debris. Such material eventually will fall in the main vent to produce similar ejections.
An elongated strip of fallout material, 2-5cms thick, (all preexistent) was observed up to 200m SW of the vent. Very fine material was sampled some 3kms SW along the lowland pastures that surround the volcano.
A complete report (Spanish) may be found at:
http://www.ovsicori.una.ac.cr/vulcanologia/informeDeCampo/2011/Infturri180111freat2.pdf
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