A refinement of the Kirchhoff approximation to the scattered elastic fields

► The paper presents a refinement of the elastodynamic Kirchhoff approximation. ► The refinement is based on a version of the Physical Theory of Diffraction. ► Diffraction by a semi-infinite plane and an infinite wedge is considered. ► The procedure gives results accurate in all geometrical region and penumbrae. ► Comparisons between GTD, Kirchhoff and the refined Kirchhoff are presented.