Comparison of one dimensional dynamic analysis and microtremor measurement results

Abstract

The deformation level of the surface soil layer due to strong ground motion has a considerable effect in soil-structure interaction problems. The shear strain values of the near surface soil deposits which are calculated by one dimensional (1D) seismic site response analyses can also be estimated by incorporating the results obtained from Horizontal to Vertical Spectral Ratio (HVSR) analysis of microtremor data and peak horizontal acceleration value of design ground motion. In this study, the seismic behaviors of soil layers at a site located in the vicinity of North Anatolian Fault were estimated by using the results of both 1D equivalent linear seismic site response analyses for 14 different seismic excitation records and HVSR analyses of ground ambient noise-microtremor measurement data. A correlation is proposed for elastic and elasto-plastic deformation levels of surface soil layers in order to estimate the value of shear strain due to strong ground motion.