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We present a geochemical dataset acquired during continual sampling over 7months (bi-weekly) and 4 weeks (every 8 hours) in the Neuwied Basin, a part ofthe East Eifel Volcanic Field (EEVF). We used a combination of geochemical,geophysical, and statistical methods to identify potential causal processesunderlying the correlations of degassing patterns of four gases (He, Rn, CO2,O2), earth tides, and tectonic processes in three mineral springs (Nette,Kaerlich and Kobern). We explored whether temporal relations in gasconcentrations in the three mineral springs could be indicators of hiddenfaults through which the gases migrate to the surface from deeper underground.Our results do not confirm CO2 as a primary carrier gas for trace gases in allsprings. Temporal analyses of the CO2-He couple indicate that Nette andK\"arlich are directly linked via a continuous tectonic fault in an ENE-WSWtrending direction. There is also evidence that Kaerlich and Kobern (NNE-SSWfault system) and Nette and Kobern (NW-SE fault system) are tectonicallylinked. These fault linkages are unknown previously but could be related to therising numbers of earthquake events occurring in this area since 2010. We didnot find any evidence that weather processes (e.g., barometric pressure), earthtides, or low local earthquake magnitudes actively modulate degassing. Thevolcanic activity in the EEVF is dormant but not extinct and to understand andmonitor its magmatic and degassing systems, we recommend bi-weekly samplings atminimum.

Fluctuations of gas concentrations in three mineral springs of the East Eifel Volcanic field (EEVF)