ABSTRACT
On the basis of acoustic emission and deformation measurements carried on with rock samples from 2000 to 4000 m depth, the memory of paleostress in the sandstone and calcareous series was analysed. Effect of maximum stress memory in the rock induced during the rock deformation in the course of acoustic emission (AE), is called Kaiser effect. The similar effect was observed as a result of cyclic thermal loadings of carboniferous sandstone and mudstone samples. In the course of AE and also in P-wave travel time have been found the changes related to the maximum temperature memory called thermal Kaiser effect.
