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
We evaluated NOVAC (Network for Observation of Volcanic and Atmospheric Change) gas emission data from the 2015 eruption of Cotopaxi volcano (Ecuador) for BrO/SO<sub>2</sub> molar ratios. Statistical analysis of the data revealed a conspicuous periodic pattern with a periodicity of about...
Gespeichert in:
| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2017
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| In: |
Solid earth
Year: 2017, Pages: 1-28 |
| ISSN: | 1869-9529 |
| DOI: | 10.5194/se-2017-89 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.5194/se-2017-89 Verlag, kostenfrei, Volltext: https://www.solid-earth-discuss.net/se-2017-89/ 
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| Verfasserangaben: | Florian Dinger, Nicole Bobrowski, Simon Warnach, Stefan Bredemeyer, Silvana Hidalgo, Santiago Arellano, Bo Galle, Ulrich Platt, and Thomas Wagner |
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| 520 | |a We evaluated NOVAC (Network for Observation of Volcanic and Atmospheric Change) gas emission data from the 2015 eruption of Cotopaxi volcano (Ecuador) for BrO/SO<sub>2</sub> 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/SO<sub>2</sub> 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/SO<sub>2</sub> 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/SO<sub>2</sub> molar ratios and the relative humidity in the local atmosphere resulted in a comparable correlation coefficient of about 33 %. | ||
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