The literature on reservoir induced seismicity begins with the discussion of the seismic events at Lake Mead (Hoover Dam) on the Nevada-Arizona border (Carder, 1945), which was the first time such seismic phenomena had been clearly recognized. In retrospect, it appears that an even earlier example had occurred at Lake Marathon, Greece, where induced earthquakes were felt in 1931, two years after filling began, coinciding with the first time peak water level had been obtained (Gupta and Rastogi, 1976). Since that time the number of clearly identifiable cases of reservoir induced seismicity has exceeded 60, out of perhaps 11,000 reservoirs existing in the world. The state of information on the subject as of 1976 has been comprehensively covered in the book by Gupta and Rastogi, Dams and Earthquakes. More recent developments have been treated in two review articles (Gupta, 1985; Simpson, 1986) and in a book (Scholz, 1990). The object of the present article is to briefly summarize the current understanding of the subject, with special emphasis on more recent investigations.