Another earthquake shook North Texans Monday night near Alvarado in Johnson County.
A preliminary report from the U.S. Geological Survey says the magnitude-2.6 quake hit at 11:03 p.m. Monday about a mile south of south of Fort Worth.
It was the fifth quake in Texas since Saturday; no major damage has been reported in any of the quakes.
The first quake hit Saturday, two more were recorded Sunday and another one hit early Monday. The largest was a magnitude-3.6 temblor near Keene, also in Johnson County, on Sunday.
"The smaller ones are probably going to be aftershocks from the 3.6," said geophysicist Jessica Turner with the U.S. Geological Survey in Golden, Colo. "The aftershocks could come a few hours after the 3.6 or it could be days."
Turner said that it's too early to say what's causing the Texas quakes.
The series of quakes began with a magnitude 2.1 quake near Keene, about 25 miles south of Fort Worth, just before 1 a.m. on Saturday.
A 3.4 magnitude quake shook Tilden in South Texas at 3:55 a.m. Sunday. Tilden is about 40 miles west of Beeville and south of San Antonio.
The USGS says a 3.6 magnitude quake, revised upward in the aftermath from a previously reported 3.5, occurred at 12:46 p.m. Sunday four miles northeast of Keene and 21 miles south of Fort Worth.
There were reports of windows broken and items being knocked over in that one , authorities said.
A 2.2 quake struck about 1 a.m. Monday near Corsicana, about 80 miles southeast of Fort Worth, according to the USGS. The quake near Alvarado was the latest.
On record, the largest earthquake in Texas occurred on Aug. 16, 1931, when a magnitude-5.8 earthquake hit near Valentine in Jeff Davis County near Big Bend National Park.