SCHOHARIE COUNTY — The U.S. Geological Survey confirmed Friday that the shaking some northern Schoharie County residents felt just before 3 a.m. Wednesday was a minor earthquake.

No damage was reported, but the Gilboa Dam at New York City’s Schoharie Reservoir, about 30 miles south of the epicenter, was being checked Friday as a routine precaution, according to a spokeswoman for the New York City Department of Environmental Protection.

Results of the dam inspection, normally conducted after any seismic event in the region, is not expected to be available until next week.

Cobleskill Village Clerk Sheila Hay-Gillespie was sleeping in her more than 100-year-old house on Shady Tree Lane near Bramanville in the town of Cobleskill.

“The dog woke us up. He was barking and carrying on,” she said. “Shortly after that the house rumbled, you could hear a rumbling noise, and the whole house was shaking.”

It lasted about 20 seconds, Hay-Gillespie said. The dog, a bassett hound, stayed awake and nervous for another half-hour.

“He kept bugging us,” she said.

The 2:56 a.m. quake measured magnitude 2.7, according to the Lamont-Doherty Cooperative Seismographic Network reported on a U.S. Geological Survey Web site.

That is classified as a “weak” earthquake. No damage was reported, although Hay-Gillespie said an acquaintance in Central Bridge reported chandeliers swaying and dishes falling off shelves.

Howe Caverns General Manager Robert Holt said the underground tourist attraction was unaffected by the quake.

A fault line runs through the rock in the nearby Howes Cave quarry operated by Cobleskill Stone Products, Holt said.

The fault runs from Carlisle toward Clarksville in Albany County, he said.

Holt slept through the episode in his Cobleskill home, but his father, Milton Holt, was startled by it in his Central Bridge home.

The quake was also felt in the Summit area, according to Robert Holt.

“I happened to be up,” Milton Holt said. “It was like a loud explosion,” but he said he didn’t feel anything. “Then I turned the scanner on and there was some conversation about it among troopers,” he said.

Russell Marlow, who runs a meat-processing operation by his Howes Cave Road home, said the quake startled him awake.

“I heard a loud bang and it shook the house,” he said.

Living just below the Howes Cave quarry, Marlow said he first thought it was quarry blasting that regularly shakes his house, but then he realized what time it was.

“It felt like the house went up in the air … and it felt like I came up out of the bed,” he said.

“It was over just as quick as it started, and I thought I was dreaming,” Marlow said. “But then I lay there and it was still shaking, like a wave.” According to the USGS, the quake was centered about one mile from Howes Cave, in the middle of an area four miles from Schoharie, six miles from Cobleskill and seven miles from Esperance.

The last reported quake to shake the region was a 3.1 magnitude temblor centered 15 miles southwest of Rotterdam on July 23, according to USGS data.

The most recent quake in the state was a 3.8 magnitude rocker 136 miles northwest of Ogdensburg on Dec. 23.