An earthquake measured at 3.6 on the Richter scale has hit Garfield County in northwestern Oklahoma.

The U.S. Geological Survey says the quake occurred about 4:23 p.m. Friday. It was centered seven miles east-northeast of Covington, 10 miles southeast of Garber and 23 miles east-southeast of Enid.

The survey records about 50 earthquakes in Oklahoma each year, although few are reported as being felt by residents. The last earthquake in Garfield County happened on Feb. 22.

There were no reports of damage from Friday's quake.

Covington-Douglas High School principal and football coach Brian Smith says he felt and heard "a loud rumble" that sounded like thunder, but that the tremor didn't knock anything off shelves.

Source: The Associated Press