Four earthquakes centered in Irving have shaken parts of North Texas since late Saturday.
Saturday night's magnitude 3.3 quake happened at 9:15 p.m. just northeast of the old Texas Stadium site and was felt by hundreds of North Texans. The NBCDFW Facebook Fan page received more than 1,300 comments about it.
"The best way that I can describe it is when I was a kid and a plane would fly over and we would call it a sonic boom, you know the whole house would shake," said Ann Lowie of Irving. "And I felt that and then it just kept going for a little bit and I was like 'oh, I think we just had an earthquake.'"
The U.S. Geological Survey confirmed a magnitude 2.5 earthquake shook Irving at 3:40 p.m. Sunday afternoon. The epicenter was along Loop 12, just south of where it intersects with Texas 183.
A third earthquake measuring 2.3 rattled residents Monday at 7:06 a.m. The quake was centered along Spur 482, northeast of Texas 114, near Dr Pepper Snapple's headquarters.
A fourth earthquake hit Monday at about 11:45 p.m. It was a 2.2 tremor near Spur 482 and Century Center Boulevard.
The four earthquakes follow two others in Irving earlier this month.
"Kind of unusual, but that doesn't mean that it's not natural and that they are small earthquakes across the United States," said Southern Methodist University seismologist Brian Stump.
Stump and his team have been tracking recent earthquakes across North Texas starting Oct. 31, 2008.
"Some cases there's been wastewater injector wells nearby and so there's a historical record of the injection of fluids going back to the 1960s and in some cases, may be triggering these small events," said Stump.
Saturday's quake fractured a two-inch water line beneath Portales Lane in Irving, just south off Texas 183 near MacArthur Boulevard, sending water rushing down the private road.
"We've got some slab leaks out here because it's part of what this property deals with, this particular plumbing system that deals with that," said Sharon Gross, who lives at the Del Paseo Townhomes.
Crews are fixing the leak Tuesday, which lowered water pressure to the 60 townhomes in the development.