U.S. earthquake insurance premium prices are based on scanty data and may be insufficient to cover losses, according to a rating firm analysis.

Standard & Poor's said that predicting earthquakes is extremely difficult, and historically major ones have not been forecasted.

It noted that the U.S. Geological Survey estimates that over the next 30 years the probability of a major quake is 67 percent for the San Francisco Bay area and 60 percent for Southern California.

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