When it comes to a major earthquake hitting the U.S., geologists say it's not a matter of if but when. In fact, an earthquake as big as the magnitude 8.8 quake that shook Chile may be overdue in California, which sits on hundreds of faults. Strong infrastructure helped Chile avoid Haiti's devastation, but the destruction of some of its key highways has raised questions about the quality of its transportation arteries and attracted the interest of U.S. planners, who fear that aging bridges and overpasses in the U.S. could suffer the same fate.

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