A magnitude 3.3 earthquake shook a rural area south of San Antonio early Saturday morning.

The U.S. Geological Survey said the quake, whose epicenter was about 44 miles southeast of the city, struck at about 4:35 a.m. No damage was reported.

A 4.8 magnitude quake struck the area last month, the largest recorded in South Texas since USGS began keeping track.

Experts say small earthquakes are not uncommon in the area. Alan Dutton, chairman of the Department of Geological Sciences at the University of Texas at San Antonio, has said the region gets a tremor about every two to four years.

The state's largest recorded quake happened Aug. 16, 1931 — a 5.8 magnitude temblor near Valentine in far West Texas' Jeff Davis County.

Ana Ley