Abstract
A theory of wave propagation in shallow jointed rocks is presented. The elastic waves from a source are propagated around the tip of an open joint. The depth of the joint is determined from known intercept times, wave velocities and joint spacing. The principles developed in this paper are compared with the theory of seismic refraction, and are verified in model experiments on artificial joints in concrete blocks. Field tests were made in an open pit and an underground mine. An explosive pulse exciter for generation of P- and SH-waves is described. The depth of jointing in the rock walls is determined by field observations and logging in bore holes, and the results confirm the theory.
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