Regional differences in the characteristics of seismic wave emission and propagation in Kamchatka and the Northern Caucasus

Abstract

A very strong difference in accelerograms is dem� onstrated for the typical earthquakes in Kamchatka and the Northern Caucasus related to the differences in the regional characteristics of emission and propa� gation of seismic waves. The strong scatter of peak accelerations and the parameters of oscillation dura� tion does not allow us to apply the simple relations of the correlation between the seismic intensity and peak acceleration over the entire territory of Russia. The duration of oscillations should also be taken into account. Mapping of the seismic intensity in the form of the seismic intensity numbers chart realized in the OSR�97 charts is correct, but in order to construct the zoning charts in peak accelerations, it is necessary to study in detail the regional peculiarities of the emis� sion and propagation of the seismic waves over the entire territory of Russia. The account for the regional peculiarities of the emission and propagation of seismic waves is neces� sary for the construction industry in seismic regions and the study of these peculiarities is important for such a big country as Russia. Accelerograms of earth� quakes can also be different in seismic regions located far from each other, which differ in their geological and tectonic structure. The level of seismic hazard on the territory of the Russian Federation is characterized in the charts of seismic zoning OSR�97�A, B, and C. The charts reflect the seismic intensity, and the probability that it can be exceeded within 50 years is 10% (OSR�97�A), 5% (OSR�97�B), and 1% (OSR�97�C). According to