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India being a large landmass is particularly prone to earthquakes. The Indian subcontinent is divided into five seismic zones with respect to the severity of the earthquakes. The severe hazard zones are roughly confined to plate boundary regions, i.e. the Himalayan frontal arc in the North, the chaman fault region in the North-West and the Indo-Burma region in the North-East. The lower hazard zone is confined to Indian shield in the south and then moderate hazard zone is confined to the transitional zone in between the two. The bureau of Indian standards is the official agency for publishing the seismic hazard maps and codes. It has brought out versions of seismic zoning map: a six zone map in 1962, a seven zone map in 1966 and a five zone map in 1970/1984. The last of these maps is currently valid; this map was created based on the values of maximum MM intensities recorded in various parts of the country in historic times.