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Desgasificación de dióxido de carbono por flujo advectivo del volcán Usu, Japón
P A Hernández1, K Notsu, J M Salazar
1Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo, Bunkyo-Ku 113-0033, Tokyo, Japan. phdez@iter.rcanaria.es
Science (New York, N.Y.)
|April 9, 2001
Resumen
La desgasificación de dióxido de carbono (CO2) magmático en el volcán Usu aumentó antes de la erupción del año 2000. Después de la erupción, el flujo de CO2 disminuyó, lo que sugiere una rápida liberación de diques de magma.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Volcanología Volcanología.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- La desgasificación de dióxido de carbono (CO2) magmático es un indicador clave de la actividad volcánica.
- La comprensión de los patrones de migración de gases es crucial para el pronóstico de erupciones.
Objetivo del estudio:
- Para analizar los patrones de desgasificación de CO2 antes y después de la erupción del volcán Usu del año 2000.
- Para investigar la relación entre los cambios en el flujo de CO2 y los procesos volcánicos.
Principales métodos:
- Monitoreo del flujo de CO2 en la caldera de la cumbre del volcán Usu.
- Análisis de las observaciones sísmicas en conjunto con los datos de flujo de gas.
Principales resultados:
- El flujo de CO2 aumentó de 120 a 340 toneladas métricas por día seis meses antes de la erupción.
- Se observó una disminución significativa en el flujo de CO2 a 39 toneladas métricas por día tres meses después de la erupción.
- Los datos sísmicos indicaron que los procesos advectivos controlaban la migración de gases antes de la erupción.
Conclusiones:
- Los aumentos del flujo de CO2 previos a la erupción sugieren una migración de gases advectiva.
- La disminución del flujo de CO2 posterior a la erupción probablemente fue el resultado de una rápida liberación durante la erupción.
- La dinámica de la migración de gases está estrechamente relacionada con los procesos de las cámaras de magma y la propagación de diques.
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