Abstract
The neighbouring volcanoes Villarrica and Llaima are two of the most active volcanoes in Chile and both currently degas continuously. We present a semi-continuous time series of SO2 fluxes for Villarrica and Llaima volcanoes. The time series was obtained using five scanning Mini-Differential Optical Absorption Spectrometers (Mini-DOAS, UV spectrometers) over 6 months (13 February to 31 July 2010) and is based on 6,829 scans for Villarrica and 7,165 scans for Llaima. Statistical analyses of the SO2 flux time series reveal a periodicity of degassing maxima about every 7 days, and further a conspicuous synchronicity of the degassing maxima and minima between the two volcanoes. Intra-day variations in SO2 fluxes also show a striking correlation between Villarrica and Llaima. All these patterns correlate well with the trend of the modelled solid Earth tide curves, where the 7-day degassing maxima correspond with both the fortnightly tidal maxima and minima. The intra-day degassing peaks mostly correlate well with the periods of maximum deformation rates during the diurnal tidal cycle, and further with semidiurnal minima in atmospheric pressure, a phenomenon we refer to as “the tidal pump”. As there is little time lag between the tidal action and the changes in degassing rates, we infer that degassing at both volcanoes is controlled by conduit convection, involving physical separation between gas and magma at comparatively shallow levels. Variations in daily degassing rates were up to a factor of ca. 12 and 10 for Villarrica and Llaima, respectively, without any noticeable changes in the periodicity. We thus suggest that the described cyclic variations must be taken into account for all comparable volcanoes when using gas monitoring as a tool for volcanic hazard mitigation.
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Acknowledgments
We thank Bo Galle and Kristin Garofalo for invaluable help with the installation of the Mini-DOAS instruments, and Fernando Gil Cruz, Claudia Bucarey and Christian Delgado and everybody else at OVDAS for excellent support during repeated visits to Chile. Discussions with Armin Freundt, Cindy Mora Stock, Bo Galle, Santiago Arellano and Vladimir Conde Jacobo are highly appreciated. Constructive comments by Michael Manga and an anonymous reviewer helped improve the manuscript. This publication is contribution No. 262 of the Sonderforschungsbereich 574 “Volatiles and Fluids in Subduction Zones” at Kiel University.
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Bredemeyer, S., Hansteen, T.H. Synchronous degassing patterns of the neighbouring volcanoes Llaima and Villarrica in south-central Chile: the influence of tidal forces. Int J Earth Sci (Geol Rundsch) 103, 1999–2012 (2014). https://doi.org/10.1007/s00531-014-1029-2
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DOI: https://doi.org/10.1007/s00531-014-1029-2