The project was devoted to the processes related to oblique subduction in Nicaragua and was realised at two institutes: one year at the Geodesy Laboratory at Miami University and one year at the department of geodynamics at GFZ Potsdam. Following the reviewers' recommendations, the strategy of the Nicaragua proposal which was initially very broad was reconsidered depending on two main aspects: 1) the future plans and 2) the progressive development of numerical modelling techniques. In other words, the project was part of a long-term plan toward the understanding of the forearc and arc permanent deformation and the relationship to the temporary, elastic deformation and subduction earthquakes. Secondly, for a deep understanding of the processes and parameters in play, the working method was to start from simple models to complex ones. Accordingly, this works focused first on the reactivation of the structures in the Nicaragua volcanic arc based on seismic and geological data and Coulomb stress calculations. The main question treated was: what is the relationship of the fault activity in the arc a) to the subduction earthquakes and b) to the long-term shear deformation as evidenced by the GPS data? The second studied aspect was the formation of upper plate structures in relationship to the coupling at the subduction interface. Elastoplastic models of the Nicaragua forearc deformation was developed and constrained by various geophysical and geological data.