Predicting earthquakes

The Great San Francisco Earthquake(s) On October 8th, 1865, the "Great San Francisco Earthquake" hit south of the city of San Francisco, magnitude 6.3. On October 21st, 1868, the 'Great San Francisco Earthquake" hit near Haywards, east of the city, across the bay, magnitude 6.8. On April 18th, 1906, the "Great San Francisco Earthquake" hit the Bay Area, magnitude 7.6. The death tolls were unknown (but small), 30, and about 3,000, respectively. Eighteen significant earthquakes happened after that (and five or so had happened between the first "great quakes") before February 9th, 1971, when…