For the second night in a row, an earthquake rattled Central Oklahoma late Saturday night, waking residents, breaking dishes and generally startling people more accustomed to natural disasters from above than from below their feet.

The quake, which the United States Geological Survey said had a preliminary magnitude of 5.6, occurred about 10:53 p.m. and was centered near Sparks, Okla., a town of 137 people about 45 miles east of Oklahoma City.

Justin Reese, manager of the Boomarang Diner in nearby Chandler, Okla., the seat of Lincoln County, said the shaking went on for about a minute and 40 seconds. He said that there was some damage but that it was too dark to say how much.

“It was scary,” said Mr. Reese, who added that Oklahomans “were not used to something like that.”

Neither the police department nor the fire department in Chandler reported any emergencies related to the quake. The Lincoln County Sheriff’s Department reported some structural and road damage.