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The decryption of the temporal sequence of volcanic eruptions is a key stepin better anticipating future events. Volcanic activity is the result of acomplex interaction between internal and external processes, with time scalesspanning multiple orders of magnitude. We review periodicities that have beendetected or correlated with volcanic eruptions/phenomena and interpreted asresulting from external forces. Taking a global perspective and longer timescales than a few years, we approach this interaction by analyzing three timeseries using singular spectral analysis: the global number of volcaniceruptions (NVE) between 1700 and 2022, the number of sunspots (ISSN), a proxyfor solar activity, the polar motion (PM) and length of day (lod), two proxiesfor gravitational force. Several pseudo-periodicities are common to NVE andISSN, in addition to the 11-year Schwabe cycle that has been reported inprevious work, but NVE shares even more periodicities with PM. Thesequasi-periodic components range from ~5 to ~130 years. We interpret ouranalytical results in light of the Laplace's paradigm and propose that,similarly to the movement of Earth's rotation axis, global eruptive activity ismodulated by commensurable orbital moments of the Jovian planets, whoseinfluence is also detected in solar activity.

On the external forcing of global eruptive activity in the past 300 years