1 Detailed Ground Response Analysis at Park Hotel in Kolkata City, India M. Akhila Research student, Earthquake Engineering Research Centre, International Institute of Information Technology Hyderabad. Gachibowli, Hyderabad, India, Email:akhila.manne@research.iiit.ac.in Chandan Ghosh Professor & Head [GeoHazards Division], National Inst. of Disaster Management, Ministry of Home Affairs, Govt. of India, New Delhi, India. D. Neelima Satyam Assistant professor, Earthquake Engineering Research Centre, International Institute of Information Technology Hyderabad Gachibowli, Hyderabad, India. SUMMARY: It is the most discerned fact that earthquake ground motion alters as it propagates through the soil from bedrock to the surface. The parameters that need to be defined in order to estimate the ground response during an earthquake are mainly dependent on the earthquake magnitude, local geology, surface topography, fault mechanism, the length of the propagation path between the source and site, and dynamic properties of the soil through which the seismic waves travel from the focus (Abrahamson & Shedlock 1997). The ground motion analysis is one of the pivotal tasks of a geotechnical engineer in seismically active areas. In this paper, a study on ground response analysis at the Park hotel located in Kolkata city, India is carried out detailed which lies in seismic zone III (IS: 1893, 2002) of the zonation map of India. It has several active faults in the vicinity. The Peak Ground Acceleration (PGA) of the city ranges from 0.1g to 0.34g. Amplification has always been a significant parameter for civil engineering structures. The site amplification factors for the city are found out using the shear wave velocities with which the ground response can be analyzed. Keywords: Vulnerability, Amplification factor, Ground Response, Seismic Hazard 1. INTRODUCTION: Influence of near surface geological conditions in the form of sediment amplification or site response is apparent from the damage distribution of many destructive earthquakes (Edward H., 1996).Earthquake damage is a function of the magnitude or the energy released, which is termed as the source, path and site. Magnitude of earthquake, degree of shaking, and destruction caused is dependent on numerous factors. Magnitude of an earthquake is proportional to the energy released and it might attenuate or amplify as it travels away and when spread over larger province. The degree of shaking of ground relies on the matching of the fundamental frequency of ground and the building and the degree of damage of structure is in turn influenced by the properties and type of rock, soil deposits, tectonic and geomorphologic features. Susceptibility of subsoil to liquefaction, a complex behavior of soil due to the decrease in effective stress, is also regulated by the degree of shaking. Hence, it is essential to carry out the ground response analysis to find out the ground motion parameters. About 56% of Indian subcontinent is prone to different levels of seismic hazard. Indian landmass can be divided into three major tectonic provinces known as the Himalayan, Indo-Gangetic and Peninsular India.