It has been demonstrated that the anisotropy of magnetic susceptibility (AMS) is a sensitive indicator for distinguishing various processes that had acted during and after the deposition of sediments. Recently, much attention has been focused on proving its usefulness in distinguishing early deformation signatures in sediments which show no visible grain-scale deformation. Here, we present the AMS results of the Neogene Miura Group of Central Japan, which was formed by arc-arc collision tectonics with subdivisions of two contrasting tectonic provinces: the southern province, a highly deformed accretionary prism and slope basin, and the northern province, a gently deformed forearc basin. Samples were collected from 21 sites in both tectonic settings. We obtained from axes orientations three typical fabric domains considered to represent sedimentary, tectonically deformed, and their intermediate types. The shape parameters of AMS also revealed distinctions clearly. Sedimentary fabrics are more foliated and anisotropic. Deformed fabrics show a more prolate shape and are closer to being isotropic. The sedimentary fabrics predominate in the northern forearc basin sequence whereas the intermediate and deformed fabrics occur predominantly in the southern province. The general trend of the shape of the magnetic fabric in studied sediments reveals a clear evolution in the pattern of the isotropic tectonic fabric constructed from foliated sedimentary fabric. ¿ American Geophysical Union 1996