Note the cusps developping in the qSV wavefront. At 0.42 s the direct P wave has reached the surface and is reflected. In the elastic part, the qSV wavefront with its cusps and the attached guided wave is well developped. The Scholte waves are well separated from other wavefronts. After 0.98 s, the reflections from the surface have hit the inter-grid boundary and extend the multiple series in the upper grid.
Weaker diffractions are also visible as transmissions into the elastic part below the top.
Einbeziehung der freien Oberfl che mit Topographie. Ber cksichtigung der freien Oberfl che mithilfe einer spektralen Tschebyscheff-Methode. Meeres- und Klimaforschung. Elastic wave propagation simulation in the presence of surface topography. Weak elastic anisotropy.