The Loma Prieta Earthquake of 1989


                                            Loma Preita Facts

"WHEN:  5:04 P.M., Tuesday, October 17, 1989. The shaking lasted 20 seconds.

WHERE: The epicenter was on the San Andreas fault  56 miles south of San Francisco and 10 miles northeast of Santa Cruz, near Mt. Loma Prieta in the Santa Cruz Mountains. The focal depth was 11 miles (typical California earthquake focal depths are 4 to 6 miles). Loma Prieta ruptured the southernmost 30 miles of the break that caused the 1906 San Francisco Earthquake.

 Magnitude established at 6.9 after consultation with monitoring stations around the world. The Loma Prieta quake was felt as far away as San Diego and western Nevada.

AFTERSHOCKS: A magnitude 5.2 aftershock occurred approximately 2.5 minutes after the main shock. In the week following Loma Prieta, 20 aftershocks magnitude 4.0 or greater and more than 300 of magnitude 2.5 or greater were recorded. Thousands of aftershocks were recorded. The aftershock zone stretched 25 miles, from north of Los Gatos near Highway 17 to south of Watsonville near Highway 101.

DEATHS AND INJURIES : 63 people were killed, 3,757 were reported injured and 12,053 displaced.

DAMAGE: Damage and business interruption estimates reached as high as $10 billion, with direct damage estimated at $6.8 billion. 18,306 houses were damaged and 963 were destroyed. 2,575 businesses were damaged and 147 were destroyed. The most notable damage included the collapse of the elevated Cypress Structure section of Interstate 880 in Oakland, the collapse of a section of roadbed on the Bay Bridge, and extensive damage to downtown Santa Cruz and San Francisco's Marina District. The Bay Bridge was unusable for a month. Also, the World Series between the San Francisco Giants and Oakland A's was postponed."