Abstract
India’s high earthquake risk and vulnerability is evident from the fact that about 59 % of India’s land area could face moderate to severe earthquakes. North India and particularly the Himalayan belt have experienced many strong to moderate earthquakes since eighteenth century. Some of the major earthquakes in past are having the magnitude more than 7.0 MW. The present study focuses the progressive modifications on the National seismic zonation map of India officially by National agencies, other individual studies and by International Program and summarizes the seismic microzonation work performed for some of the strategic important mega cities in India. This study also analyzes the systematic development of zonation maps and various methods adopted. It has been found that the different techniques have been adopted for microzonation studies of major mega cities. The detailed methodology for Microzonation of National Capital Region of Delhi (NCR of Delhi) has been presented as a case study which emphases on the improvement of these techniques for better use in the future.
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