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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2017-89
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
04 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
Periodicity in the BrO/SO2 molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015
Florian Dinger1,2, Nicole Bobrowski1,2, Simon Warnach1,2, Stefan Bredemeyer3, Silvana Hidalgo4, Santiago Arellano5, Bo Galle5, Ulrich Platt1,2, and Thomas Wagner1 1Max-Planck Institut for Chemisty, Mainz, Germany
2Institute for Environmental Physics, University of Heidelberg, Germany
3GEOMAR, Kiel, Germany
4Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador
5Department of Earth and Space Sciences, Chalmers University of Technology, Gothenburg, Sweden
Abstract. We evaluated NOVAC (Network for Observation of Volcanic and Atmospheric Change) gas emission data from the 2015 eruption of Cotopaxi volcano (Ecuador) for BrO/SO2 molar ratios. Statistical analysis of the data revealed a conspicuous periodic pattern with a periodicity of about two weeks in a three month time series. While the time series is too short to rule out a chance recurrence of transient geological or meteorological events as a possible origin for the periodic signal, we nevertheless took this observation as a motivation to examine the influence of natural forcings with periodicities of around two weeks on volcanic gas emissions. One strong aspirant with such a periodicity are the Earth tides, which are thus central in this study. We present the BrO/SO2 data, analyse the reliability of the periodic signal, discuss a possible meteorological or eruption-induced origin of this signal, and compare the signal with the theoretical ground surface displacement pattern caused by the Earth tides. Central result is the observation of a significant correlation between the BrO/SO2 molar ratios with the North-South and vertical components of the calculated tide-induced surface displacement with correlation coefficients of 47 % and 36 %, respectively. From all other investigated parameters, only the correlation between the BrO/SO2 molar ratios and the relative humidity in the local atmosphere resulted in a comparable correlation coefficient of about 33 %.

Citation: Dinger, F., Bobrowski, N., Warnach, S., Bredemeyer, S., Hidalgo, S., Arellano, S., Galle, B., Platt, U., and Wagner, T.: Periodicity in the BrO/SO2 molar ratios in the volcanic gas plume of Cotopaxi and its correlation with the Earth tides during the eruption in 2015, Solid Earth Discuss., https://doi.org/10.5194/se-2017-89, in review, 2017.
Florian Dinger et al.
Florian Dinger et al.
Florian Dinger et al.

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Short summary
We monitored the bromine monoxide to sulphur dioxide molar ratio in the effusive gas plume of Cotopaxi volcano, in order to gain insight in those geological processes which control the pressure regime of the volcanic system. We observed a conspicuous periodic pattern with a periodicity of about two weeks which significantly correlates with the Earth tidal forcing. Our results support a possible Earth tidal impact on volcanic activity, in particular for the Cotopaxi eruption 2015.
We monitored the bromine monoxide to sulphur dioxide molar ratio in the effusive gas plume of...
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