Although the Center 's site was thought to have little motion during earthquakes , which are frequent in the Los Angeles area , in 1994 , as the Center was being constructed , the Northridge earthquake struck . It caused " disturbing hairline cracks ... in the welds and plated joints of the steel framework . " As a result , the steelwork through the site was retrofitted . The Center 's buildings are thought to be able to survive an earthquake of 7.5 magnitude on the Richter scale
Northridge earthquake
1994 Northridge earthquake
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