Earthquake map of the Hayward Fault and surrounding region
Earthquake map of the Hayward Fault and surrounding region. (Map modified from S Sleeter and others, 2004). The map shows the epicenter and magnitude for earthquakes between 1970 and 2003. The epicenter of the estimated magnitude 7.0 earthquake in 1868 was probably in the Hayward or Fremont area, but the surface rupture extended from Fremont to Berkeley (see USGS Earthquake Hazards Team, 2007). The red star shows an educated guess about the epicenter for the 1868 earthquake (no reliable record of the earthquake exists from that period). The yellow star shows the location of the recent M 5.4 Alum Rock earthquake of October 30, 2007 on the Calaveras Fault (near where it merges with the southern end of the Hayward Fault system). |
