Probabilistic Seismic Hazard Studies of East Coast Region of India

Abstract eng:
2 Seismic hazard studies are required for estimating ground motion parameters expected to occur at bedrock levels at a particular site during strong earthquakes. This paper presents probabilistic seismic hazard analysis (PSHA) carried out for Kalpakkam, India, a low seismicity region of the east coromandel coast 80 km south of Chennai. Kalpakkam is known for its nuclear power plants and affiliated research stations. Seismic hazard is characterized by the probability of exceeding a given level of a ground motion parameter (e.g. peak ground acceleration) at least once in a number of years corresponding to the life time of a structure. In a specific sense, seismic hazard is the probability of experiencing a specified intensity at a particular site in some time period of interest. Four appropriate attenuation models have been used for the estimation of peak ground acceleration (PGA) due to poorly known attenuation characteristics of the region. Hazard curves can be used to select the design seismic input at a site and the same can be used in the seismic response analysis of structures.

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