A minor earthquake was recorded Tuesday night at the McAlester Ammunition Depot in Pittsburg County.

The quake rated 3.3 on the Richter scale at 10:14 p.m., the U.S. Geological Survey reported. The epicenter was at the depot, about 6 1/2 miles northwest of Savanna. A previous story said the earthquake was recorded today.

According to the Oklahoma Geological Survey, the state averaged 56 quakes a year from 1977 to 2008.

Usually, fewer than five per year, if any, are felt.

Anyone who felt the quake can fill out a report at the Oklahoma Geological Survey's Web site, or the U.S. Geological Survey's Web site. Reports can be made anonymously.