Fig. 2.
From: Simulations of P-SV wave scattering due to cracks by the 2-D finite difference method
Oscillation of both faces of an isolated crack due to the incidence of a quasi-monochromatic P wave train (ka = 2.4, ha = 1.39) observed at around the center of the crack. The panels with ‘Hor.’ and ‘Vert.’ indicate horizontal and vertical displacement, respectively. (a) Seismograms for a horizontal crack due to normal wave incidence. Solid and dashed curves correspond to the upper (shaded) and lower (illuminated) faces, respectively. In the upper panel, the solid curve masks the dashed one. (b) Seismograms for a vertical crack due to parallel wave incidence. Solid and dashed curves correspond to the left and right crack faces, respectively. In the lower panel, the solid curve masks the dashed one.