A map has shown an underwater ... Should the West Coast fault line shift it would cause a nine-magnitude earthquake far worse ...

Using underwater mapping techniques, scientists have mapped the Cascadia Subduction Zone - a 600-mile fault line extending ...

The Cascadia subduction ... any day now. The fault runs for 700 miles off the coasts of California, Oregon, and Washington. But surprisingly, no one knew about the fault line until 45 years ...