Taking into account the directional diagrams of seismic radiation from the earthquake source during seismic microzoning of construction sites

The paper presents the technique of using seismic directional diagrams in the calculation of seismic hazard for construction sites. The study made using as an example the impact of the Vrancea zone to construction sites in Kiev. Also it talks about the theoretical possible mechanisms of earthquakes, including the earthquake mechanisms that prevail in the Vrancea area. Analises the influence of the main characteristics of the mechanisms of earthquake foci in the Vrancea area and effects that may occur in Kyiv. Discusses aspects that are unaccounted in modern building codes of Ukraine, about the influence of directional diagrams of seismic energy from the earthquake foci on site. There is an equation which can be used to make calculations of directional seismic diagrams. Points the necessity of performing such calculations to improve the accuracy of the results of the seismic zoning thanks to what appears an opportunity to improve the ratio “price – quality” for earthquake-proof constructing.