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Nicholas George looks under a buckled highway just outside of Napa, California after earthquake struck the area in the early hours of Sunday August 24.
Nicholas George looks under a buckled highway just outside of Napa, California after earthquake struck the area in the early hours of Sunday August 24.

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    Scientists: Hayward Fault overdue for big earthquake

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Scientists: Hayward Fault overdue for big earthquake

Tuesday's magnitude-4.0 earthquake in the San Francisco Bay Area caused relatively little damage, but it gave a glimpse of the potential geological threats the region could face. CNN affiliate KPIX reports.

Scientists: Hayward Fault overdue for big earthquake

Tuesday's magnitude-4.0 earthquake in the San Francisco Bay Area caused relatively little damage, but it gave a glimpse of the potential geological threats the region could face. CNN affiliate KPIX reports.