This paper updates the 1974 Geotechnique paper on the same subject by Sherard, Cluff, and Allen. Geologists and seismologists are now able to recognize the presence of, and assess the degree of activity of, faults in dam foundations far more effectively than only a few years ago, thanks to a variety of new neotectonic tools. Similarly, engineers are increasingly able to accept possible foundation displacements with a variety of innovative measures in dam design. Brief case studies of faults beneath dams are presented, and some mitigative measures are described, for Auburn Dam site (USA), Clyde Dam (New Zealand), Eastside Reservoir USA), Lauro Dam (USA), Matahina Dam (New Zealand), Ridgway Dam (USA), Seven Oaks Dam (USA), Steno Dam site (Greece), and Tarbela Dam (Pakistan)
