BEND, Ore. -- One person was killed and rescuers continued searching on Sunday for two others after a group of people were swept over an Oregon waterfall, authorities said. The group went over Dillon ...

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Today's magnitude 7.7 earthquake was so big that it wouldn't be surprising if the ground were displaced several meters horizontally, van der Pluijm added. "This is a very big earthquake," he said.

Additionally, the way earthquakes are measured on a logarithmic scale, meaning that what appears to be a small increase in magnitude is really a much more significant one.

A series of minor earthquakes has been shaking the Pacific Northwest, with the latest tremors felt in Auburn, Bremerton and Fall City.

California has been rocked by at least nine earthquakes since Thursday, raising fears that the "Big One" could be near.

Earthquakes and tsunamis are a looming presence in Oregon. According to experts, "the big one" — a magnitude 8.0 or higher earthquake — is imminent from the Cascadia Subduction Zone off the coast.