Timeline of earthquakes on the Hayward Fault

Study of excavations across the Hayward Fault has provided a record of strong earthquakes, all estimated at magnitude of 6.3 or greater, going back hundreds of years—some historical events are shown for reference. The dates for earthquakes before 1868 are based on radiocarbon dating. Note that the interval between successive quakes has varied from 95 to 183 years, averaging 150 years, and it is now more than 150 years since the 1868 earthquake.