6.5-magnitude earthquake strikes off NorCal coast

FERNDALE, Calif. -- A powerful 6.5-magnitude earthquake hit offshore in Northern California Thursday morning, the US Geological Survey reported.

The earthquake struck about 110 miles west of Eureka just before 7 a.m. The depth of the epicenter was located 6.2 miles beneath the surface in a known divergent plate boundary.

There is no tsunami threat from the quake, the Pacific Tsunami Warning Center said.  Hazardous harbor waves are still possible.

There have been no reports of injuries or damage.

The USGS initially said the magnitude was 6.8, but later revised it.