By Jeremy A. Kaplan  - FOXNews.com   When it comes to a devastating earthquake in California, the question isn't if but when. What magnitude would cause disaster, and what would it look like? U.S. Geological Survey Damage to Fourth Avenue in… more »

By William M. Welch, Dan Vergano and Chris Hawley, USA TODAY One of the really "Big Ones" to shake the United States was a magnitude-9.0 earthquake along the Pacific Northwest coast more than 300 years ago, before the arrival of people and development,… more »