The session Volcano deformation, dynamics, and deep structure deals with the documentation and modelling of the deformation, dynamics, and internal structure of volcanoes. The focus is on advancing our understanding of current deformation of active volcanoes through data and models as to their dynamic behaviour and internal structure. All types of surface deformation are of interest, including elastic inflation, deflation, as well as caldera and flank collapses. The dynamic behaviour includes stress measurements and modelling, as well as physical properties of the rocks that constitute the volcanoes. As regards internal structure, topics of interest include near-surface parts, such as exposed in fault and caldera walls, as well as the deep roots and plumbing system of active and eroded volcanoes, as revealed through geophysical and geological studies. The loading conditions considered in this session include tectonic forces, magma, and gravity. Studies of both subaerial and submarine volcanic areas are welcome.

The principal aims are to understand how volcanoes deform, the associated dynamic behaviour, and the implications for hazards. We welcome contributions based on results from fieldwork, remote-sensing studies, geophysical and geodetic measurements, and analytical, analog, and numerical simulations. The session includes, but is not restricted to, the following topics: volcanism and regional tectonics; formation of magma chambers, laccoliths, and other intrusions; dyke propagation, emplacement, and arrest; earthquakes and eruptions; caldera collapse, resurgence, and unrest; flank collapse; volcano deformation and hazard mitigation; physical properties of volcanic rocks.