Risk of Big California Quake in Next 30 Years Rises : DNews — news.discovery.com

The risk of a major earthquake hitting California in the next 30 years has risen dramatically, scientists said Tuesday, using improved forecasting techniques. Earthquakes are notoriously hard to predict and while seismic activity in California has stayed mild in the last century, experts expect a big one to strike some time in the future -- they just don't know when. "The likelihood that California will experience a magnitude 8 or larger earthquake in the next 30 years has increased from about 4.7 percent... to about 7.0 percent," said the US Geological Survey.

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