T.V. McEvilly W. H. Bakun 1979 Moderate-sized earthquakes (Richter magnitude ML 5 1/2) have occurred four times this century (1901, 1922, 1934, and 1966) on the San Andreas fault near Parkfield in central California. In many respects the June 1966 sequence was a remarkably detailed repetition of the June 1934 sequence, suggesting a recurring recognizable pattern of stress and fault zone behavior. application/pdf 10.1126/science.205.4413.1375 en American Association for the Advancement of Science Earthquakes near Parkfield, California: Comparing the 1934 and 1966 sequences article