It is noteworthy that in the z-osc series is evident a peak around the year 2006 (as in the CH 4 geochemical data series) as well as in the original up-lift time series where, around the same year, there is a step followed by an increasing trend (Fig. 4 A).
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Principal component analysis on twenty years (2000-2020) of geochemical and geophysical observations at Campi Flegrei active caldera.
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