IRVING, Texas — The Dallas area has had another minor earthquake.
The U.S. Geological Survey reports a 3.1 magnitude quake happened at 6:18 a.m. CST Friday. The quake was centered 3 miles east-northeast of Irving.
Police in Irving had no immediate reports of damage or anyone hurt in Friday morning's earthquake.
Seismologists have said that dozens of small quakes rattling North Texas in recent months were concentrated along a narrow 2 mile subsurface fault. Experts from Southern Methodist University weeks ago placed more than 20 monitors around the quake sites and then determined the fault existed.
Officials are still trying to figure out what's been causing the earthquakes.