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Since decades researchers investigate volcanoes to understand the dynamic magmatic system behind, and tried to discover a supposed magma chamber. The idea that magma is boiling in a spherical or elliptical shaped chamber and erupted in case of a pressure increase, is very old and not only an imagination of non-geoscientists. Nevertheless, the question where fluids and magma are ascending and stored is perhaps the most interesting one for volcanologists. Nowadays, large seismic networks and radar imaging of the earth surface help to understand dynamic processes. F.i. to explain observed deformation pattern at volcanoes simple imagination often help to model volume and pressure sources causing these deformation signals. Seismic compressional and shear waves give us a chance to distinguish between liquid and solid material. Further, seismic data recorded by dense seismic networks and investigated with tomographic methods allow to image possible reservoirs and ascent paths of fluids and partial melts in the crust and upper mantle. But also the stability of volcano flanks can be derived f.i. by the determination of the effect of attenuation of seismic waves. These information helps not only to improve our knowledge about a volcanic system understanding but also it is important for volcanic hazard and risk assessment.