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We propose a one-directional three-component (1D-3C) approach to model theunidirectional (1D) propagation of a three component (3C) earthquake forseismic response analyses of horizontal multilayer soils, considering a 3Dnonlinear constitutive behaviour for soils. An elasto-plastic cyclicconstitutive behaviour of the Masing-Prandtl-Iwan type, using just the shearmodulus decay curve for soil characterization, is implemented in a finiteelement scheme. Seismic response of soil profiles appears dependent on incidentwave polarization, elastic and dynamic properties of medium and seismicimpedance contrast between soil layers. Propagating a 3C signal induces amultiaxial stress interaction decreasing soil strength and increasing nonlineareffects. Soil profiles in the Tohoku area (Japan) are loaded by seismic signalsrecorded at outcrops or downhole, during the 2011 Tohoku earthquake. Thenonlinear seismic response of each soil profile, represented in terms ofacceleration, hysteresis loops and stress and strain profiles with depth, iscompared in both cases of superposition of three one-component propagationeffects (1D-1C) and 1D-3C.

Mod\'elisation 1D-3Composantes de la r\'eponse sismique d'une colonne de sol multicouche \`a comportement non lin\'eaire