At 12:32 a.m. a magnitude 7.9 earthquake happened 170 miles southeast of Kodiak, Alaska.
It triggered a Tsunami Watch along the coasts of Washington, Oregon and California. The watch has now been cancelled.
Despite the large magnitude of the earthquake there have been no reports of signifcant damage on Kodiak Island.
In Alaska, tsunami warnings were triggered on cell phones telling residents to move to higher ground.
Residents of Kodiak say the ground shook for about 30 seconds.
It doesn't appear a tsunami wave was generated by the earthquake.