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Abstract

This appendix illustrates various source radiation patterns related to VP/VS ratios of elastic media. The force term from the wave equation is defined in terms of point forces and a moment tensor. Radiation patterns of wavefield amplitude are illustrated in polar diagrams for point forces on the free surface. These are based on the theory of Miller and Pursey (1954) for computing the displacement field in a half-space. They derive asymptotic expressions for the far-field strength at infinity in the solid. Synthetic seismograms from a single explosive charge are compared with the wavefield from vertical arrays of distributed charges. These are illustrated in the space domain computed from acoustic finite-difference models. The last example shows the P-wave radiation patterns from shear couples.

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