INFLUENCE OF THE SOILS TYPES ON THE STRONG GROUND MOTIONS INTENSITY

Abstract

Study of the different soils forms influence on the intensity of the strong ground motions manifestation based on the records data base, created by the authors is carried out. The correlation dependences of intensity on the logarithm of peak horizontal accelerationandon the hypocentral distance separately are obtained for different types of soil (rock, sand, gravel, silt, clay). For the different groundswith the high magnitudes the intensity valueis in follows descending order: clay, sand, silt, gravel, rock. The conducted investigation showed the weak dependence of intensity on the transverse wave speed. The comparison of the correlation dependences of intensity on the magnitude and on the hypocentral distance for records of database SMDB CGI with Shebalin formula showed thatthe accuracy of the authors formula for all types of grounds and Shebalin formula is identical in the ranges of error. For the system KNET stations it is better to use the formula of correlation dependence of intensity on the magnitude and on the logarithm of peak horizontal acceleration, than the correlation dependence on the magnitude and on the hypocentral distance logarithm.