<P> The 1989 Loma Prieta earthquake occurred in Northern California on October 17 at 5 : 04 p.m. local time ( 1989 - 10 - 18 00 : 04 UTC ) . The shock was centered in The Forest of Nisene Marks State Park approximately 10 mi ( 16 km ) northeast of Santa Cruz on a section of the San Andreas Fault System and was named for the nearby Loma Prieta Peak in the Santa Cruz Mountains . With a moment magnitude of 6.9 and a maximum Mercalli intensity of IX ( Violent ) , the shock was responsible for 63 deaths and 3,757 injuries . The Loma Prieta segment of the San Andreas Fault System had been relatively inactive since the 1906 San Francisco earthquake ( to the degree that it was designated a seismic gap ) until two moderate foreshocks occurred in June 1988 and again in August 1989 . </P>
<P> The 1989 Loma Prieta earthquake occurred in Northern California on October 17 at 5 : 04 p.m. local time ( 1989 - 10 - 18 00 : 04 UTC ) . The shock was centered in The Forest of Nisene Marks State Park approximately 10 mi ( 16 km ) northeast of Santa Cruz on a section of the San Andreas Fault System and was named for the nearby Loma Prieta Peak in the Santa Cruz Mountains . With a moment magnitude of 6.9 and a maximum Mercalli intensity of IX ( Violent ) , the shock was responsible for 63 deaths and 3,757 injuries . The Loma Prieta segment of the San Andreas Fault System had been relatively inactive since the 1906 San Francisco earthquake ( to the degree that it was designated a seismic gap ) until two moderate foreshocks occurred in June 1988 and again in August 1989 . </P>
what was the magnitude of the 1989 san francisco earthquake
what was the magnitude of the 1989 san francisco earthquake
6.9
6.9