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Discussion papers
https://doi.org/10.5194/se-2019-14
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-14
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 12 Feb 2019

Research article | 12 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

On the link between Earth tides and volcanic degassing

Florian Dinger1,2, Stefan Bredemeyer3,4, Santiago Arellano5, Nicole Bobrowski1,2, Ulrich Platt1,2, and Thomas Wagner1 Florian Dinger et al.
  • 1Max-Planck Institute for Chemistry, Mainz, Germany
  • 2Institute of Environmental Physics, University of Heidelberg, Germany
  • 3GEOMAR, Kiel, Germany
  • 4GFZ, Potsdam, Germany
  • 5Department of Space, Earth and Environment, Chalmers University of Technology, Gothenburg, Sweden

Abstract. Long-term measurements of volcanic gas emissions conducted during the recent decade suggest that under certain conditions the magnitude or chemical composition of volcanic emissions exhibits periodic variations with a period of about two weeks. A possible cause of such a periodicity can be attributed to the Earth tidal potential. The phenomenology of such a link has been debated for long, but no quantitative model has yet been proposed. The aim of this paper is to elucidate whether a causal link from the tidal forcing to variation in the volcanic degassing can be traced analytically. We model the response of a simplified magmatic system to the local tidal gravity variations and derive a periodical vertical magma displacement in the conduit with an amplitude of 0.1–1 m, depending on geometry and physical state of the magmatic system. We find that while the tide-induced vertical magma displacement has presumably no significant direct effect on the volatile solubility, the differential magma flow across the radial conduit profile may result in a significant increase of the bubble coalescence rate in a depth of several kilometres by up to several ten percent. Because bubble coalescence facilitates separation of gas from magma and thus enhances volatile degassing, we argue that the derived tidal variation may propagate to a manifestation of varying volcanic degassing behaviour. The presented model provides a first basic framework which establishes an analytical understanding of the link between the Earth tides and volcanic degassing.

Florian Dinger et al.
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Short summary
Evidences for tidal impacts on volcanism have been gathered by numerous empirical studies. This paper elucidates whether a causal link from the tidal forces to a variation in the volcanic degassing can be traced analytically. We model the response of a simplified magmatic system to the local tidal gravity variations, find that the tide-induced dynamics may significantly alter the bubble coalescence rate, and discuss the consequences for the volcanic degassing behaviour.
Evidences for tidal impacts on volcanism have been gathered by numerous empirical studies. This...
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