NUMERICAL STUDY OF LOCAL, SITE EFFECTS ON THE CHARACTERISTICS OF STRONG GROUND MOTION

Abstract

The main objective of this dissertation is to study the local site effects on the characteristics of the strong ground motion. Parsimonious staggered grid finite difference method has been used in the computations instead of standard staggered grid scheme since it requires lesser computational memory and enjoys the same advantage of being stable at large poission's ratio and free from the spatial derivative of elastic parameters. Different shear dislocation sources using SH-wave have been generated with the help of partial stress drop in the form of Ricker wavelet and the radiation patterns were found in good agreement with the numerical and analytical radiation patterns. The effects of stress drop, rupture area, slip and time steps on the ground response have been studied for the purpose of numerical source scaling and results were fond in concordance with the different relations developed in the past based on the observed data. The effects ' of various basin geometry on the characteristic of SGM has been studies in detail and results depect that basin causes amplification in amplitude and duration. These effects are further amplified when basin is narrow and deep. Also, changes in the ground response due to half filled and full - filled reservoir for different source position has been studied.