The building is designed for zone V, i.e. the highest seismic Zone of the country although the project lies in zone IV and the legal compliance require design for Zone IV only. The reason for this extra preparedness is as follows:
"The seismic zone maps are revised from time to time as more understanding is gained on the geology, the seismotectonics and the seismic activity in the country. The Indian Standards provided the first seismic zone map in 1962, which was later revised in 1967 and again in 1970 (Figure 3). The map has been revised again in 2002 (Fig. 4) and it now has only four seismic zones – II, III, IV and V. The areas falling in seismic zone I in the 1970 version of the map are merged with those of seismic zone II. Also, the seismic zone map in the peninsular region has been modified. Madras now comes in seismic zone III as against in zone II in the 1970 version of the map. This 2002 seismic zone map is not the final word on the seismic hazard of the country, and hence there can be no sense of complacency in this regard."
Authored by: C.V.R.Murty
Indian Institute of Technology Kanpur Kanpur, India
Sponsored by: Building Materials and Technology Promotion Council, New Delhi, India