Emisión difusa de CO2 y actividad volcánica en el volcán Poás, Costa Rica

Abstract

Four concentration and soil efflux CO 2 surveys were undertaken in the period 2000-2003 at Poás volcano , with the aim of evaluating the total diffuse CO 2 emission and investigating their spatial distributions. The CO 2 concentration and total diffuse emission showed a minimum value at 2000, followed by a significant increase at 2001 and finally a decrease at 2003 study. The spatial distribution of soil CO 2 efflux and the δ 13 C isotopic composition in the CO 2 showed a good agreement with the location of the main volcanic-structural characteristics of the area, with the main CO 2 emission anomalies observed close to the fumarolic fields and hot springs. A magmatic intrusion during occurred in the period 1998-2004 at Poás might be the responsible of the observed CO 2 emission changes. Monitoring diffuse CO 2 emission has became an important geochemical tool for the monitoring of Poás volcanic activity. RESUMEN: Entre 2000 y 2003, se realizaron cuatro estudios de la concentración y flujo difuso de CO 2 en el Poás, con el fin de investigar la distribución espacial y evaluar la emisión total de CO 2 a la atmósfera por este sistema. La evolu-ción temporal de la concentración y flujo difuso de CO 2 muestra un mínimo en la emisión en el año 2000 seguida de un