ShakeMaps for the 1868 Hayward Quake and the 1989 Loma Prieta Quake

ShakeMap showing the inferred intensity of ground shaking in the 1868 earthquake (measured as MMI, or Modified Mercalli Intensity), compared to a ShakeMap for the 1989 magnitude 6.9 Loma Prieta earthquake. Red lines are major earthquake faults; black line shows the portion of the Hayward Fault that ruptured in 1868; diamonds show locations of damage reports (1868) and seismic recordings (1989).