Abstract
Seismic exploration industry is largely based on the concept of an impulsive point source whose radiation pattern in isotropic media is well‐known. It is spherically isotropic in acoustic unbounded homogeneous media and directional in elastic media. A point source excitation in a simplified isotropic medium lend no credence what may happen in more realistic situations. In this paper, we present an analysis of the the radiation patterns for a vertical and a rotational loads distributed over a disk‐shape surface placed in a finely stratified medium with a random distribution of elastic parameters. This complex source simulates the rotary drill tool used in boreholes. It is shown that the radiation patterns in these cases significantly differ from those computed for a point force in isotropic homogeneous media.
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