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SH transient problem for the elastic half-space including a micro plane crack is considered. If there is no crack we can exactly analyze this problem with application of the Cagniard method. Even if there is a crack we can correctly estimate the stress response at the crack position on the arrival time of wave-front incoming to the crack. The calculated stress value at the crack position is newly defined as the stress boundary condition. The transient reflection response spreading outward from the crack can be analyzed by using the Wiener-Hopf technique. The reflection region from the crack is shifted by the parallel translation and the rotation of the coordinate, and is superimposed on the no crack response region. Finally, for stress, strain energy and displacement, the transient responses are calculated for all wave field and shown in the form of the contour mapping representation.

Reflection Response of SH Transient Waves from a Micro Plane Crack in Elastic Half-Space