Just 7% of homeowners in the United States have earthquake insurance despite updated maps from the U.S. Geological Survey (USGS) showing that some areas of the country are at risk of earthquakes and the potential associated costs are also on the rise, reports the Insurance Information Institute (III).The potential cost of earthquakes is growing while the number of those in the U.S. with coverage is declining in many parts of the country, notes a statement issued Monday by III, a non-profit, communications organization supported by the insurance industry.