In view of the major advancement made in understanding the seismicity and seismotectonics of the region, an updated probabilistic seismic hazard map of Kerala and its vicinity covering 5°-16°N and 72°-81°E was prepared. The earthquake catalogue was prepared by compiling the data from different national and international agencies. The sesismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones which are associated with earthquakes of magnitude 3 and above. The seismicity parameters were estimated for the region and and the hazard parameters (Rock level Peak Horizontal Acceleration (PHA) and spectral accelerations for periods 0.1s and 1s) were calculated considering all the seismic sources within a radius of 300 km. Epistemic uncertainty in hazard has been tackled within a logic-tree framework considering three types of source models and three attenuation models. The contour maps showing spatial variation of spectral acceleration values both at bed rock and surface level are presented in the paper.
Dr. Sreevalsa Kolathayar and Sitharam, T. G., “Probabilistic Evaluation of Seismic Hazard in and around Kerala”, in Indian Geotechnical Conference (IGC-2011) , Kochi, 2011.