- Quake shakes ocean floor around 6:50 a.m. PT
- No tsunami warning issued
The quake, centered about 102 miles west of Ferndale, California, happened around 6:50 a.m. PT.
Light shaking was reported from east central Oregon to areas a few dozen miles south of San Francisco, the USGS said.
No tsunami threat is expected from the quake, the Pacific Tsunami Warning Center said. There were no immediate reports of injuries or serious damage.
The quake led to inconveniences for some commuters in the San Francisco area. Bay Area Rapid Transit trains temporarily moved at a reduced speed after the temblor, leading to delays of about 10 minutes, the transit system's Twitter account said. The move was precautionary, CNN affiliate KGO reported
The USGS initially said the magnitude was 6.8, but later revised it.