Using Crater Lake chemistry to predict volcanic activity at Poás Volcano, Costa Rica

Gary L. Rowe, Shinji Ohsawa, Bokuichiro Takano, Susan L. Brantley, Jose F. Fernandez, Jorge Barquero

Research output: Contribution to journalArticle

105 Scopus citations

Abstract

Monitoring of crater lake chemistry during the recent decline and disappearance of the crater lake of Poás Volcano revealed that large variations in SO4/Cl, F/Cl, and Mg/Cl ratios were caused by the enhanced release of HCl vapor from the lake surface due to increasing lake temperature and solution acidity. Variation in the concentration of polythionic acids (H2SxO6, x=4-6) was the most reliable predictor of renewed phreatic eruptive activity at the volcano, exhibiting sharp decreases three months prior to the initiation of phreatic eruptions in June 1987. Polythionic acids may offer a direct indicator of changing subsurface magmatic activity whereas chloride-based element ratios may be influenced by surface volatilization of HCl and subsequent recycling of acidic fluids in crater lake volcanoes.

Original languageEnglish (US)
Pages (from-to)494-503
Number of pages10
JournalBulletin of Volcanology
Volume54
Issue number6
DOIs
StatePublished - Aug 1 1992

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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