2. Geological Survey of India (GSI) deals with the subject of Geology at Government of India level, Seismologic observations are dealt with by India Meteorological Department (IMD), the Central Water & Power Research Station (CWPRS) deals with Seismological investigations as related to Engineering Structures, Department of Earthquake Engineering, University of Roorkee is the premier institution assisting in studies related to seismic design parameters and seismic design of structures. In addition, through specific projects National Geophysical Research Institute (NGRI), Wadia institute of Himalayan Geology (WIHG), National Remote Sensing Agency (NRSA), Survey of India (SOI) and the Department of Science & Technology contribute on the subject.
3. The Ministry of Water Resources set up in the year 1969, a Standing Committee for determination of Design Seismic Coefficient with experts drawn from above mentioned institutions to advise project authorities about the seismic parameters to be adopted for design of dams. The above committee, renamed as National Committee on Seismic Design Parameters has so far advised agencies of more than 125 clams regarding seismic design parameters. Utilising such advice, seismic coefficient was suggested as 0.125 g for the preliminary design and the basic dam sections were evolved by the State Design Engineers. Later, specific studies were commissioned to evolve the Seismic Design Parameters through Department of Earthquake Engineering, University of Roorkee. Based on a report and suggestions obtained from these studies, the detailed designs were proceeded with.
4. The Central Water Commission (CWC) is the apex organisation in Water Resources Sector with strong in-built Design and Research (D&R) Organisation. It provides guidance to all the state D&R Organisations besides rendering consultancy for specific jobs. Some Indian Institute of Technologies (Its) and Engineering Colleges spread through out the country are also engaged in consultancy work in specific cases on seismic design of dams.
5. Most of National Agencies mentioned above were involved in various stages for the consideration of design of Sardar Sarovar Dam. The seismo — technic investigations were conducted by the GSI since early stages. The studies related to the evolution of seismic parameters were undertaken and carried out in the Department of Earthquake Engineering, University of Roorkee by a Group of Experts in different fields like Geology, Earthquake Engineering and Civil Engineering. The designs were considered in detail, by an international Dam Design Review Panel. The Panel had consultation with Dr. R.W.CIough of University of Berkeley, who in-turn consulted Prof. Bruce A Bolt of the University of California. Thus, it would be seen that the project had full infrastructural capability to evolve a safe and sound design of dam and other components.
6. During the actual design, the seismic parameters considered are -
• Magnitude of earthquake - 6.5 on Richter scale
• Epicentre - 1 2 km
• Depth of focus - 10 km
• Horizontal seismic co-efficient - 0.125 g

(I) Apart from the above mentioned studies, studies of reservoir induced seismic ity (RIS) and rim stability have been carried out by the Geological Survey of India (GSI), Central Water and Power Research Station (CWPKS), University of Roorkee and World Bank Consultants.

8. Government of Gujarat has identified 9 locations for the installation of seismic monitoring stations, 4 each on either side and one at the downstream of the Sardar Sarovar reservoir, out of a total of 9 stations, 3 are in M.P., 1 in Maharashtra & 5 are in Gujarat. Construction and instrumentation installation work is completed at all the 9 seismic monitoring stations. The seismological observatory at Kevadia Colony is in operation since 1973. The data of Kevadia Colony seismograph station for the period from 1973 to 1984 was analysed by CWPRS, Pune and GERI, Vadodara. Also, Micro-earthquake surveys around Navagam Dam were carried out in the year 1980 by Dept. of Earthquake Engineering, University of Roorkee. The Microearthquake activity was found to be of low level and was generally scattered in the Narmada basin.