Seismic hazards of a chosen site with a view to current knowledge

The application of the seismological and geological knowledge of the area has of late gained importance in the methods of calculating the seismic hazard to the locality selected for the construction of a nuclear power plant. Next to the seismostatic estimate of the magnitude of the maximum calculated earthquake it is also necessary to incorporate in the calculation seismological criteria specifying this value. This includes the determination of the time behaviour of ground motion in the given locality owing to the effects of an earthquake. This is mainly the time course of acceleration, i.e., the accelerogram which determines the scale of antiseismic measures for structures. As on the territory of Czechoslovakia the direct measurement of strong effects of earthquakes practically does not come into consideration, such approach has to be selected which is founded on the determination of analogical accelerograms. (Z.M.)