San Andreas Fault Major Earthquakes By loukanorthcoombes Jan 9, 1857 1857 Fort Tejon earthquake Magnitude 7.9 Deaths, 2. It occured along that portion of the San Andreas Fault line. Apr 18, 1906 1906 San Francisco earthquake It happened in the coast of Northern California. This had a magnitude of 7.9 More than 3,000 people died.