Second quake shakes Northern California

QUINCY, California (CNN) -- Another minor earthquake struck an area of Northern California early Saturday, the second quake in two days.

The 3.9 magnitude earthquake occurred at 5:01 a.m. (8:01 a.m. ET) Saturday, the U.S. Geological Survey said. It happened about eight miles northwest of Portola, near the spot where a minor temblor struck Friday afternoon.

"It got my attention," said Plumas County Sheriff dispatcher Becky Grant. "No damage or anything like that. Just people calling to say it woke them up and scared them."

Although Friday's quake resulted in no reports of major damage or injuries, it was reportedly felt as far away as Sacramento and Reno, Nevada.

The 5.5 magnitude earthquake struck about 1:19 p.m. PT (4:19 p.m. ET) between Portola and Quincy.

"In Portola, about 30 miles east of here, there were reports that the shaking lasted about four seconds and knocked stuff off the walls," said a Plumas County Sheriff's Department dispatcher.

In Quincy, about 95 miles northeast of Sacramento, the dispatcher said people felt "just a little shaking" during the quake.

U.S. Geological Survey spokeswoman Pat Jorgenson said it's not surprising the tremors were felt so far from the quake's epicenter.

"The granite in that area is a great conductor for spreading the shock waves great distances," she said.