  We study SU(3)-structures induced on orientable hypersurfaces of
seven-dimensional manifolds with G_2-structure. Taking Gray-Hervella types for
both structures into account, we relate the type of SU(3)-structure and the
type of G_2-structure with the shape tensor of the hypersurface. Additionaly,
we show how to compute the intrinsic SU(3)-torsion and the intrinsic
G_2-torsion by means of exterior algebra.
