EPOS (European Plate Observing System) is a long term integration plan of Research Infrastructures for solid Earth Science in Europe. EPOS is promoting and making possible innovative approaches for a better understanding of processes controlling earthquakes, volcanic eruptions, tsunamis, surface dynamics and tectonics. EPOS will develop new concepts and tools to better address the grand challenges in solid Earth Science by answering to the questions (including geo-hazards and geo-resources) relevant to the environment and human welfare.