The epicenter of the magnitude 7.1 quake was located about 10 miles northeast of Santa Cruz along a segment of the San Andreas fault, near Loma Prieta peak, the highest peak in the Santa Cruz Mountains. It was felt over an area of about 54,000 square miles. The rupture occurred on a 30-mile length of the San Andreas fault called the Santa Cruz Mountains segment. The focus was eleven and a half miles underground at a spot near China Ridge in Nisene Marks State Park. ... Surface displacements with offsets of up to 3 or 4 feet along a zone about 20 miles long would normally be expected to ac...

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The earthquake was centered about 60 miles south of San Francisco and could be felt as far away as San Diego. ... This was no easy task because the 8.4-mile bridge now needs to survive the possibility of a 7.3 magnitude earthquake generated by the Hayward fault and an 8.0 magnitude earthquake generated by the San Andreas Fault. ... The bridge's surface area measures 16.5 million square feet between its three spans. ...

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