Downed power lines, gas leaks and damaged roads were reported after the 6.4 magnitude quake off northern California.

A magnitude 6.4 earthquake has struck off the coast of northern California, cutting power to tens of thousands.

The quake, about 24 miles off the coast of the port city of Eureka, hit at 2:34am (10:00 GMT) on Tuesday, according to the United States Geological Survey (USGS).

Two injuries were reported, although the USGS said an initial assessment showed a low likelihood of casualties.

Still, the earthquake cut power to more than 70,000 people in Humboldt County according to the outage tracker site, poweroutage.us.

“Power is out across the county. Do not call 911 unless you are experiencing an immediate emergency,” the Humboldt County Office of Emergency Services tweeted.

Small rockslides were also reported and at least one roadway buckled during the quake, which was followed by dozens of small aftershocks.