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Knowledge of how volcanic systems work has been mainly gained from studies on individual volcanoes first based on specific methodologies and more and more on multi-method approaches (e.g., McNutt, 1996 Newhall and Punongbayan, 1996 Battaglia et al., 2006 Dzurisin, 2006 Sigmundsson et al., 2015 Gudmundsson et al., 2016).

Although the conditions that make a volcano ready to enter in eruption are still elusive, deciphering those that participate in the destabilization of metastable systems could provide new insights on the processes leading to eruption triggering. The triggering of volcanic eruptions represents the ultimate stage of a series of non-linear physico-chemical processes. Our results show the influence of global processes on volcanic activity and open many questions to further investigate these multi-scale interactions. Its multi-decadal variations result in a mass reorganization in the oceans whose associated stress changes may impact processes generating volcanic eruptions worldwide. We found multi-decadal components of similar periodicities present in both time-series which we link to those already recognized in the polar motion. We analyzed the number of monthly volcanic eruptions and the global mean sea level between 18 using the Singular Spectrum Analysis time-series analysis technique to evaluate the existence of common periodicities. With the present study, we propose to consider a global viewpoint to address this interaction. However, the interplay between this quasi-permanent forcing and volcanic systems is still poorly understood. Many studies have tackled this tidal influence on the onset of volcanic eruptions and more generally, on volcanic activity. Studying a large number of volcanic eruptions is a way to decipher general characteristics related to volcano dynamics but also on external forcing influencing it, such as solid Earth and ocean tides.

3Instituto Dom Luiz (IDL), Universidade do Algarve, Faro, Portugal.2Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli-Osservatorio Vesuviano, Napoli, Italy.1Instituto Dom Luiz (IDL), Universidade da Beira Interior, Covilhã, Portugal.Stéphanie Dumont 1* Simona Petrosino 2 Maria C.

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