METHOD OF SEISMIC MICROZONING Russian patent published in 2001 - IPC

FIELD: structural seismology, evaluation of intensity of vibrations with due account of properties of soils composing construction site. SUBSTANCE: seismic vibrations are excited in soil by artificial vibration source, they are recorded by geophones placed on sections with different engineering and geological conditions. Velocities of propagation of longitudinal waves in examined and standard soils located at distances less and greater than lengths of wave of seismic vibrations are measured. Increment of vibration magnitude is found from relation where 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; 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; ΔV₀₁ 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; ΔV₀₂ 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 increments of vibration magnitude. EFFECT: increased reliability and accuracy of method owing to control over contribution of inelastic phenomena into resulting soil motion. 2 tbl