On October 17, 1989, the San Francisco Bay area of the United States experienced the 6.9 magnitude Loma Prieta earthquake.   

The Loma Prieta earthquake was triggered by the  San Andreas Fault, where the massive Pacific plate slips northwestward. The epicenter slipped up to two meters (six feet) during the quake.  

The Loma Prieta earthquake caused 63 deaths, 3,757 injuries, and about $6 billion in damage.  Many casualties occurred as parts of several transportation routes, including the San Francisco-Oakland Bay Bridge and a busy freeway, collapsed.