The Bhuj earthquake of 2001 is considered as the deadliest stable continental shield region earthquake. One of the main reasons for heavy damage during the Bhuj earthquake was the effects of site amplification and liquefaction. This paper tries to evaluate one of these geotechnical aspects – liquefaction, based on a performance-based approach. The seismic hazard assessment of Gujarat (at bed rock level) was evaluated using Probabilistic Seismic hazard Assessment (PSHA) method. Based on the rock level peak horizontal acceleration (PHA) values obtained, the surface level peak ground acceleration (PGA) values were evaluated by amplification coefficients suggested by Raghu Kanth and Iyengar for Peninsular India. Using the PGA values, the liquefaction potential was evaluated based on a performance-based approach. The liquefaction potential was evaluated based on the corrected SPT value required to prevent liquefaction. The spatial variation of SPT values required to prevent liquefaction for return periods of 475 and 2500 years are presented in this paper. The results obtained in this study can be used for macro level planning and liquefaction hazard mitigation of Gujarat.
K. S. Vipin, Sitharam, T. G., and Dr. Sreevalsa Kolathayar, “Probabilistic Assessment of Liquefaction Potential for the State of Gujarat”, in Indian Geotechnical Conference (IGC-2011) , 2011.