Volcanoes are complex systems that evolve in space and time as a result of their eruptive activity. Volcanic eruptions represent the ultimate expression of a complex interplay between internal and external processes that span across different time scales. Deciphering how internal and external processes interact at the time scale of eruptions may provide key insights on the temporal evolution of eruptions and also help to better evaluate associated volcanic hazards. Studies of the tidal influence on volcanic activity have fallen within this context, although the cause-effect relationship between tides and eruptions is still unclear. In this study, we used Singular Spectrum Analysis to analyze three time-series, namely the seismic tremor, SO₂ emission and lava volume flow rate, which cover the first month of effusive activity at Fogo volcano, Cape Verde, in 2014–2015. We detect 9 tidal periodicities and up to 5 in each time-series ranging from semi-diurnal to fortnightly periods. We show that the movement of magma at crustal depths and at surface as well as gas emission during the effusive eruption are all modulated by lunisolar gravitational forces. We highlight the relevance of the volcano location on Earth, which together with the timing of the eruption, associated with a specific astronomical configuration, result in a specific combination of tides that directly influence the volcano eruptive activity. With this data set, we further investigate the response of Fogo volcano to this external forcing. We show that during the 2014–2015 eruption, Fogo volcano acted as a bandpass filter to quasi-permanent tidal oscillations.

火山是复杂的系统，由于其爆发活动而在空间和时间上不断发展。火山喷发代表了跨越不同时间尺度的内部和外部过程之间复杂相互作用的最终表达。了解内部和外部过程在喷发时间尺度上如何相互作用，可能会提供有关喷发时间演变的关键见解，也有助于更好地评估相关的火山灾害。尽管目前尚不清楚潮汐与喷发之间的因果关系，但有关潮汐对火山活动影响的研究仍属于这一背景。在这项研究中，我们使用奇异频谱分析来分析三个时间序列，即地震震颤SO ₂排放量和熔岩体积流量，涵盖了佛得角佛戈火山2014-2015年第一个月的积水活动。从半日到每两周，我们检测到9个潮汐周期，每个时间序列最多检测5个潮汐周期。我们发现，在火山喷发过程中，岩浆在地壳深度和地表的运动以及气体的排放都受到了日月重力的影响。我们强调了火山在地球上的位置的相关性，再加上火山爆发的时间，再加上特定的天文结构，导致直接影响火山爆发活动的特定潮汐组合。利用该数据集，我们进一步研究了福戈火山对这种外部强迫的响应。我们表明，在2014-2015年喷发期间，