"That's a big fault": The terrifying 9-magnitude California earthquake which really terrifies scientists

Forget about the San Andreas Fault. The West Coast needs to worry about something else entirely

Published June 2, 2015 3:45PM (EDT)

Yes, the San Andreas Fault worries seismologists. But they've really got their eye on the Cascadia Subduction Zone, which runs from northern California all the way along Oregon and Washington and through Vancouver Island.

As this video explains, that's where the big one will come from -- someday...

By Salon Staff

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Cascadia Subduction Zone Earthquakes San Andreas Fault Science Video