An earthquake with a magnitude of 6.5 struck Thursday morning about 100 miles of the coast of Ferndale, in Humboldt County, California.
There were no immediate reports of damage. The US Geological Survey originally reported the 6:50 a.m. PT quake as having a magnitude of 6.8. About 90 minutes later, the USGS reported a quake with a magnitude of 5.0 in the nearby area.
An area police dispatcher told NBC Bay Area that she barely felt it on land, and a USGS "did you feel it" map shows light shaking was felt in Eureka and the nearby California coast.
According to USGS responses, the quake was felt in Arcata, Fortuna and Fort Bragg with some responses as far away as San Francisco and Santa Cruz.
A tsunami is not expected for California, Oregon, Washington state and Alaska, the National Weather Service tweeted.
There are roughly 56 earthquakes in that range of the Richter scale each year, according to the USGS.