From the Contents: Introduction - State of the art.- Strain and rotation seismic waves.- An investigation of an external impact conversion into the strained rotation inside ancient boulder structures (Solovky islands, White Sea).- Numerical analysis of seismic ground rotations from the wave passage effects.- Effect of angle of incidence of seismic waves on the inelastic dynamic response of irregular R/C structures.- Impact of seismic rotational components on symmetric structures.- The effect of common irregularities on the seismic performance of existing RC framed buildings.- Influence of the variability of concrete mechanical properties on the seismic response of existing RC framed structures.- Seismic response of irregular industrial steel buildings.