The papers in this volume were presented at the two-session Symposium on Vibration Effects of Earthquakes on Soils and Foundations held on 25 June 1968 during the 71st Annual Meeting of the Society at San Francisco, Calif. The Symposium was sponsored by Subcommittee 9 on Dynamic Properties of Soils, of Committee D18. Chairman of the Symposium was E. T. Selig, associate professor of engineering and applied sciences, State University of New York at Buffalo. Co-chairman was Delon Hampton, professor of civil engineering, Howard University.