Most Earth science theory flows from an understanding of the geology at the surface of the Earth. However, seismic images of the Earthâ€™s crust and upper mantle give us a detailed insight into the deeper geological structures and tectonic processes that shape the lithosphere and the modern landscapes. They are therefore relevant to natural resource exploration, the distribution and management of groundwater resources and the study and mitigation of natural hazards such as earthquakes. They define the large-scale processes that control the evolution of the landscape and soils. This symposium invites oral and poster contributions in which crustal-scale passive and/or active seismic imaging of the Earthâ€™s crust and upper mantle forms the basis of regional, possibly interdisciplinary, studies of the tectonic processes controlling the architecture of orogenic belts, rifts, sedimentary basins, cratons, continental platforms and margins, and major intraoceanic features.