SOME PROBLEMS OF THE SEISMIC MICROZONATIONPRACTICAL REALIZATION. FACTORS, WHICH FORM THE INTENSITY OF THE EARTHQUAKE

Abstract

The interrelations of the amplitudes of accelerations and oscillation spectra are established, whose special features are connected with the nonlinearly elastic and inelastic phenomena in the soils under the strong impact. The analysis of a whole series of the factors determining the level of seismic intensity is carried out. It is shown that the conditions for mapping of seismic zoning are created not in the traditional units of intensities, but directly in the accelerations unit. The calculated and instrumental-calculated methods of seismic zoning give the possibility to present the results in the form of accelerations. Consequently, in addition to the traditionally used intensity increments, it is necessary to obtain the results of the basic instrument method of seismic zoning also in the kind of accelerations. The universal indices are proposed, which can be used to account the accelerations implicitly, which are characterized by simplicity of obtaining and by large generality. The need for further refinement of the obtained indices for the purpose of the standardization of criteria is shown.