Deformation of block environments in underground nuclear explosions

The main regularities in the movement of structural blocks of various scales due to underground nuclear explosions were determined in unique experiments performed in tunnels and on the surface of a mountain massif at the Semipalatinsk test site. The spatial-temporal movement of block structures is alternating in nature. The amplitudes of differential block movements far exceed the displacements in the explosion seismic wave. The linear dimensions of blocks of various scales and their explosion-induced differential displacements are determined.