President Shamsher Prakash, respected Dr. Jai Krishna, ladies and gantlemen, I am grateful to the Indian Society of Earthquake Technology for providing me with this opportunity to present the rasults of some of the research I have conducted in collaboration with my graduate students. The subject I have chosen to present to you is the earthquake response of concrete gravity dams. This choice has been motivated by two factors. Firstly, the early impetus for my resaarch on dams was provided by an earthquake experience familiar to most of you-the earthquake that occurred in 1967 close to Koyna Dam near Poona, India. As you know, the dam was overstressed by the earthquake motions and was damaged to an alarming degree. This experience with the earthquake performance of Koyna Dam, which was designed by the best available procedure of the time, indicated that concrete gravity dams are not immune to earthquake damage as had commonly been presumed. This realization led to much interest in developing improved procedures for analysis, design and safety evaluation of concrete gravity dams. Secondly, India Is one of the few countries whare naw concrete dams are still being built, so this should be a topic of Interest to reaearchers and engineer. here, Bec.use arch dams are rare in India, this presentation Is restricted to concrete gravity dams.