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TectonicsThe process that controls the dynamicsof the outer solid layers of the Earth.It includes the processes of mountainbuilding, rifting and subduction.Tectonic structureA characteristic geometry that is theresult of rock deformation. Structurescan be classified as compressive (e.g.folds) or extensive (e.g. boudins) and asviscous (fold) or brittle (fault).KeywordsTectonic styleA characteristic combination of structuresand their spatio-temporal distribution.The transition between tectonicstyles can be controlled by rheology, initialconditions or boundary conditions.Decollement (1)A tectonic structure which separatesunits with different tectonic styles. Generallydeformation is intense above andweak below the decollement.Decollement (2)A. Interpreted seismic image of theNankai Trough accretionary prism (afterMoore et al., 2007).B, C, Geometry, vorticity and effectivepressure fields of a numerical simulationof the formation of a plate boundary.Hydro-thermo-mechanical physicsis taken into account. The dynamicallyformed simulated plate boundarygeometry and physical conditions canbe compared with the Nankai Trough'sactive margin.Decollement also often designates theshallowest part of a subduction plateboundary above which sediment maybe accreted.of a plate boundary from the subductioninitiation to an advanced stage ofplate subduction and sediment (non-)accretion. Numerical simulations canhelp us understand the non-trivial hydro-thermo-mechanicalfeedback thatgoverns the formation of structures inmature subduction zones. A particulargoal of this project is to identify thephysical conditions that control thetransition between accretionary andnon-accretionary active margins. Thisis an on-going project to which I inviteresearchers interested in subductingmargins and accretionary prisms tojoin me.ArthurBauville役職研究員E-mail abauville@jamstec.go.jp所属学会日本地球惑星科学連合専門分野欧州地球科学連合専門分野構造地質学・テクトニクス数値モデリングMAT Toolbox 2018 21