The earthquake initially registered as a 4.7 magnitude and was then downgraded to 4.4 before eventually going back up to a 4.6. The quake hit at about 2:52 a.m.
The earthquake was relatively shallow, but according to the USGS map, it was felt all the way to the Canadian border.
The epicenter of the quake was near Monroe in Snohomish County.
NWS Seattle says a Tsunami is not expected.