Antarctic Ice Stream Causing Quakes

Here is an interesting article about a river of ice in Antarctica causing seismic activity. The seismic waves are occurring twice a day with a magnitude of 7 each. They are caused each time the river moves. Basically the river is a glacier that moves about 18 inches every 12 hours. It does not move slowly over 12 hours, though, but rather all at once causing the seismic waves. These waves move rather slowly and while the magnitude is big they are not as bad as a real earthquake because of the slower movement.