State hit by 700 earthquakes

Mysterious earthquake swarm rattles Arkansas

A burst of more than 700 unexplained quakes in just six months has locals pointing fingers.

Possible culprit 

Also: 

• Mount St. Helens temblor
• Blame for extreme rainfall
• Odd fossils baffle experts

16 quakes hit Arkansas area in 1 day

Jim Sutterfield was briefly puzzled by a thumping sound that seemed to slam the back of his office chair.

Full Story