Abstract
A method based on the first motion approximation is presented for determining the radiation pattern of a buried line source. If measurements at the surface are used to obtain the P and S components of the source, the multipolar distribution of the source may be determined. The multipolar distribution is not unique since several distributions can have the same radiation pattern. Some examples are presented for simple sources. The method is applicable to real sources or virtual sources such as centers of diffraction or scattering.
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