The elastic wave equation is

(1) |

where is the particle displacement and

(2) |

where is the ``compressional'' potential and the ``shear'' potential. and are uncoupled in an unlimited homogeneous medium. Purely radial displacements such as produced by a spherical source in a homogeneous medium with the P-wave velocity

(3) |

From this we get the radial displacement

2001-09-21