Geologic Hazards

Anniversary of Loma Prieta Earthquake – USGS Warns of Hayward Fault

October 17 was the 18th anniversary of the 6.9 magnitude Loma Prieta earthquake that struck the Bay area.  But a recent story by the Bay Area’s local ABC affiliate, ABC7, chose to focus on another earthquake, a 1868 earthquake of about the same magnitude that occurred on the Hayward Fault. According to the USGS, the Hayward Fault has a return period of about 140-years and  "It’s the most heavily urbanized fault in the U.S. and it’s just waiting to go off…" Next year will be the 140-th anniversary of the last earthquake on the Hayward Fault. At some point it has the potential to be a very bad earthquake there. More after the break. (Photo by sanbeiji)