SITE RESPONSE IN GUWAHATI REGION USING STANDARD SPECTRAL RATIO

Sasanka Borah, Diganta Goswami, Jayanta Pathak

Abstract: This study attempts, through a very limited number of data to explain the requirement of a detailed seismic analysis of the western part of the Guwahati metropolitan region of Assam, India, which falls under seismic zone-V(IS:1893-2002) and consists of mainly alluvial deposits. This study carries out a Site Response study of Western part of Guwahati by employing Standard Spectral Ratio (SSR) method, which is a reference site method, where the ratio of Fourier spectrum of ground motions recorded at a soil site to that of ground motions recorded at a nearby reference site (rock site) is obtained to define the site response. Significant site response in terms of site amplification is observed in the frequency range of 0.1 to 1.00 Hz, which concretes the necessity of a detailed analysis program for the region

Keywords: Site Response, Standard Spectral Ratio (SSR)

DOI: https://doi.org/10.15623/ijret.2016.0504016