Anomalous Diffuse CO2 Emission prior to the January 2002 Short-term Unrest at San Miguel Volcano, El Salvador, Central
America |
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Authors: | Nemesio M Pérez Pedro A Hernández Eleazar Padrón Rafael Cartagena Rodolfo Olmos Francisco Barahona Gladys Melián Pedro Salazar Dina L López |
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Institution: | (1) Environmental Research Division, Instituto Tecnológico y de Energías Renovables (ITER), 38611 Granadilla, S/C de Tenerife, Spain;(2) Instituto de Ciencias de la Tierra, Universidad de El Salvador, El Salvador, Central America;(3) Department of Geological Sciences, 316 Clippinger Laboratories Ohio University, Athens, OH 45701, USA |
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Abstract: | On January 16, 2002, short-term unrest occurred at San Miguel volcano. A gas-and-steamash plume rose a few hundred meters
above the summit crater. An anomalous microseismicity pattern, about 75 events between 7:30 and 10:30 hours, was also observed.
Continuous monitoring of CO2 efflux on the volcano started on November 24, 2001, in the attempt to provide a multidisciplinary approach for its volcanic
surveillance. The background mean of the diffuse CO2 emission is about 16 g m-2 d-1, but a 17- fold increase, up to 270 g m-2 d-1, was detected on January 7, nine days before the January 2002 short-term unrest at San Miguel volcano. These observed anomalous
changes on diffuse CO2 degassing could be related to either a sharp increase of CO2 pressure within the volcanic-hydrothermal system or degassing from an uprising fresh gas-rich magma within the shallow plumbing
system of the volcano since meteorological fluctuations cannot explain this observed increase of diffuse CO2 emission. |
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Keywords: | San Miguel volcanic activity diffuse degassing carbon dioxide |
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