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Partial subsidence at the edge of hot-acidic lake: Poas Volcano, Costa Rica
From: Eliecer Duarte <eduarte@xxxxxxxxx>
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A subtle, semicircular scar (observed few months ago) progressed rapidly to a a sharp scarp on the south shore of the hot-acidic lake of Poas Volcano. Such sudden change is accompanied with incandescence at the middle steep wall of the dome neighboring the lake (near 670ºC). The 60m wide, 2.5m cliff shows degassing and geyser type activity on the west end, next to the steaming lake.
Such horseshoe shapes were observed after phreatic eruptions in the early months of 2006.
More details (photos and map) in this Spanish field report:
http://www.ovsicori.una.ac.cr/vulcanologia/informeDeCampo/2011/InfoVPoas23711Escarpe.pdf
From: Eliecer Duarte <eduarte@xxxxxxxxx>
***********************************************************************************************
A subtle, semicircular scar (observed few months ago) progressed rapidly to a a sharp scarp on the south shore of the hot-acidic lake of Poas Volcano. Such sudden change is accompanied with incandescence at the middle steep wall of the dome neighboring the lake (near 670ºC). The 60m wide, 2.5m cliff shows degassing and geyser type activity on the west end, next to the steaming lake.
Such horseshoe shapes were observed after phreatic eruptions in the early months of 2006.
More details (photos and map) in this Spanish field report:
http://www.ovsicori.una.ac.cr/vulcanologia/informeDeCampo/2011/InfoVPoas23711Escarpe.pdf
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