A U.S. Geological Survey report says that there is more than a 70 percent chance that a 6.7 magnitude or higher earthquake will hit the Bay Area in the next 30 years. Here's why San Francisco is not as ready as one may think when the next big earthquake hits.

Two major earthquakes have hit the Bay Area in modern history. In 1906, a 7.9 magnitude earthquake hit San Francisco and 80 percent of the city's buildings fell or burnt to the ground, leaving 300,000 people homeless and killing nearly 3,000. In 1989, a 6.9 magnitude quake caused the ground to liquefy in parts of the city and collapsed highways, killing more than 60 people.

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Why San Francisco's Earthquake Risk Is Growing