Volcanic dynamics are driven by the complex interplay between fluid flow (circulation of magmatic or hydrothermal fluids) and rock structure (volcano conduits, dykes), the comprehension of which requires both multi-parametric monitoring and modelling of relevant physical and chemical processes of the system. Understanding the factors controlling the dynamics of the processes involved in these interactions is necessary to characterize the overall behaviour of a volcano and the eventual transition mechanisms among stationarity, unrest phase, and eruptive styles. The starting point in this context is to have high-quality data (seismological, geochemical, geodetic, volcanological) on several parameters, acquired both over years of monitoring activity and focused field experiments. Fundamental contributions come from the use of combined multi-parametric datasets and the adoption of innovative techniques and multi-disciplinary approaches. This volume is addressed to those researchers who focus their investigations on the field of volcano dynamics. Its main aim is to shed light on the processes occurring in active volcanic systems over different timescales, with relevant implications for the hazards and the modern monitoring, thus promoting future discussions on this topic.

The articles of this special issue are the outcome of the research presented at the following events:

• Session GMPV5.11, “Fluid-solid interactions in volcanic processes over different time-scales: an investigation through geophysical and volcanological data”, EGU2019, 7-12 April 2019, Vienna, Austria;
• Session S01.11, “Understanding volcanic processes through geophysical and volcanological data investigations. Cities On Volcanoes 10”, IAVCEI, 2-7 September 2018, Naples, Italy.