To give you an idea how these numbers can add up, think of it in terms of the energy released by explosives: a magnitude 1 seismic wave releases as much energy as blowing up 6 ounces of TNT. A ...

Reports of the quakes flooded out of Texas after the first shook people awake in Hermleigh at 10.38pm, which registered as a 4.9 magnitude - the eighth strongest in the state's history.