Last week's earthquake off the coast of Humboldt County triggered a tsunami warning urging people across a huge swath of California and Oregon to evacuate. Why aren't tsunami warnings more precise?

Last week's earthquake off the coast of Humboldt County triggered a tsunami warning urging people across a huge swath of California and Oregon to evacuate. Why aren't tsunami warnings more precise?

The quakes come a week after a magnitude 7.0 earthquake hit off the coast of California with shaking felt for miles.

The Pacific West Coast has the highest risk levels of tsunamis in the United States. Here’s where they have stuck in Northern ...