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. 2017 Aug 14;7:8099. doi: 10.1038/s41598-017-08192-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Geochemical gas composition during unrest. CO ₂/H ₂ O (left, red dots) and CH ₄/H ₂ O (right, blue dots) ratios measurements against time. April 1, when the decrease of CH ₄/H ₂ O stops and the increase of CO ₂/H ₂ O starts, is marked by a black bar. September-October 1983 (between the vertical dashed lines) corresponds to the period when fluid injections are perturbing the upper hydrothermal system at Solfatara, following the fluid-flow modelling of Chiodini et al.¹⁷. The plot is obtained using the plotting functions of Microsoft Excel^© for Mac 2011 14.4.9 (https://www.microsoft.com/en-us/download/details.aspx?id=46571).