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pure and applied geophysics

, Volume 163, Issue 4, pp 883–896 | Cite as

Anomalous Diffuse CO2 Emission prior to the January 2002 Short-term Unrest at San Miguel Volcano, El Salvador, Central America

  • Nemesio M. Pérez
  • Pedro A. Hernández
  • Eleazar Padrón
  • Rafael Cartagena
  • Rodolfo Olmos
  • Francisco Barahona
  • Gladys Melián
  • Pedro Salazar
  • Dina L. López
Article

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.

Keywords

San Miguel volcanic activity diffuse degassing carbon dioxide 

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Copyright information

© Birkhäuser Verlag, Basel, 2006

Authors and Affiliations

  • Nemesio M. Pérez
    • 1
  • Pedro A. Hernández
    • 1
  • Eleazar Padrón
    • 1
  • Rafael Cartagena
    • 2
  • Rodolfo Olmos
    • 2
  • Francisco Barahona
    • 2
  • Gladys Melián
    • 1
  • Pedro Salazar
    • 1
  • Dina L. López
    • 3
  1. 1.Environmental Research DivisionInstituto Tecnológico y de Energías Renovables (ITER)GranadillaSpain
  2. 2.Instituto de Ciencias de la TierraUniversidad de El SalvadorEl SalvadorCentral America
  3. 3.Department of Geological Sciences316 Clippinger Laboratories Ohio UniversityAthensUSA

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