Site Response Studies in Pondicherry Region

摘要

Site response studies were conducted in Pondicherry region based on the ambient noise recording for short duration to determine the ground response frequencies and corresponding amplifications of soils at eighty three selected locations of Pondicherry. These studies were carried out using short duration data of ambient seismic noise and hammer source. Besides this, multichannel analysis of surface waves (MASW) technique was conducted at these locations to estimate the shear wave velocity to compute the predominant frequencies using frequency-shear wave velocity relationships. Both the studies reveal that the southern part of the study area with alluvial and thick soil cover exhibits low frequency in the range 1 to 3 Hz and the higher frequencies are observed in the northern part of Pondicherry which comprises sandstone/limestone.