A rare earthquake shook the San Antonio area Thursday morning.

Earthquake Details | Viewers Report Feeling Earthquake |  |  |  |  | Interactive

According to the United States Geological Survey, the quake registered at 4.8 on the Richter scale at about 7:24 a.m.

The epicenter of the quake was located about 50 miles southeast of San Antonio between Pleasanton and Karnes City.

There were no immediate reports of injuries or damage.

The U.S. Geological Survey said it was the largest earthquake on record for the area, surpassing a magnitude-4.3 shock recorded in 1993.

Viewers reported feeling the earthquake from as far north as the Medical Center area to as far south as Pleasanton.

Sharon Carlin, a viewer, emailed the KSAT 12 newsroom to report the quake.

"My entire building shook. I was on the bed watching the news and the entire bed was shaking. It lasted about 25 seconds," Carlin wrote. "Both my animals were freaked out, each one thought the other was in the room and making the bed shake."

Pat Brandt, who lives at the entrance to Choke Canyon State Park near Three Rivers, emailed that she was eating breakfast when his house shook.

"The light fixture was swinging from side to side," Brandt wrote. " (I) was going to blame (my) husband for moving the table until I saw the light swinging. It really made your stomach feel funny."

In January 2010, a magnitude-2.6 quake was recorded in the area, the last one on record.