On the link between Earth tides and volcanic degassing
<p><strong>Abstract.</strong> Long-term measurements of volcanic gas emissions conducted during the last decade suggest that under certain conditions the magnitude or chemical composition of volcanic emissions exhibits periodic variations with a period of about 2 weeks. A possible...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
29 May 2019
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| In: |
Solid earth
Year: 2019, Volume: 10, Issue: 3, Pages: 725-740 |
| ISSN: | 1869-9529 |
| DOI: | https://doi.org/10.5194/se-10-725-2019 |
| Online Access: | Verlag, Volltext: https://doi.org/https://doi.org/10.5194/se-10-725-2019 Verlag, Volltext: https://www.solid-earth.net/10/725/2019/ 
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| Author Notes: | Florian Dinger, Stefan Bredemeyer, Santiago Arellano, Nicole Bobrowski, Ulrich Platt, Thomas Wagner |
| Summary: | <p><strong>Abstract.</strong> Long-term measurements of volcanic gas emissions conducted during the last decade suggest that under certain conditions the magnitude or chemical composition of volcanic emissions exhibits periodic variations with a period of about 2 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 between tidal forcing and variations in 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 the geometry and physical state of the magmatic system. We find that while the tide-induced vertical magma displacement presumably has no significant direct effect on the volatile solubility, the differential magma flow across the radial conduit profile may result in a significant increase in the bubble coalescence rate at a depth of several kilometres by up to several multiples of 10 %. 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.</p> |
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| Item Description: | Gesehen am 02.07.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1869-9529 |
| DOI: | https://doi.org/10.5194/se-10-725-2019 |