METHOD OF SEISMIC MICROZONING Russian patent published in 2001 - IPC

FIELD: structural seismology. SUBSTANCE: method is specifically related to evaluation of intensity of seismic vibrations with due account of properties of soils making up construction site. Artificial seismic source excites seismic vibrations in soil which are recorded by geophones positioned on sections with different engineering and geological conditions. Velocities of propagation of longitudinal waves and densities in examined and standards soils located at distances less and greater than lengths of waves of seismic vibrations are measured. Increments of magnitude are computed from relation , where ρ_i1 is density of examined soil located at distance less than length of wave of seismic vibrations, kg/cu m; V_i1 is velocity of propagation of longitudinal wave in examined soil located at distance less than length of wave of seismic vibrations, m/s; ΔV_i1 is change of velocity of propagation of longitudinal wave in examined soil located at distance less than length of wave of seismic vibrations, m/s; ρ_i2 is density of examined soil located at distance greater than length of wave of seismic vibrations, m/s; V_i2 is velocity of propagation of longitudinal wave in examined soil located at distance greater than length of wave of seismic vibrations, m/s; ΔV_i2 is change of velocity of propagation of longitudinal wave in examined soil located at distance greater than length of wave of seismic vibrations, m/s; ρ_o1 is density of standard soil located at distance less than length of wave of seismic vibrations, kg/cu m; V_o1 is velocity of propagation of longitudinal wave in standard soil located at distance less than length of wave of seismic vibrations. m/s; ΔV_o1 is change of velocity of propagation of longitudinal wave in standard soil located at distance less than length of wave of seismic vibrations, m/s; ρ_o2 is density of standard soil located at distance greater than length of wave of seismic vibrations, kg/cu m; V_o2 is velocity of propagation of longitudinal wave in standard soil located at distance greater than length of wave of seismic vibrations, m/s; ΔV_o2 is change of velocity of propagation of longitudinal wave in standard soil located at distance greater than length of wave of seismic vibrations, m/s. Degree of seismic effect is evaluated by values of increments of magnitude. EFFECT: increased reliability and accuracy of method thanks to control over contribution of inelastic phenomena to resulting soil motion. 2 tbl