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Interfaces of rocks with different mechanical properties influence on seismic stress field appearing in rock mass during the earthquake. This influence may increase seismic load applied to underground objects located near the interface, so it should be taking into account in seismic analysis of the structures. For this aim the problem of elasticity theory about stress state of the ring supporting an opening in the half-plane, which is united with a half-plane of another material is considered. Lengths of seismic w...