glacial quakes - additional info

http://www.msnbc.msn.com/id/11975255/from/RS.4/

Well, here is a really speedy update.  I thought I had reached the end of the article, but there was more a ways down, after some advertising.   "Melting water from the surface gradually seeps down, accumulating at the base of a glacier where it can serve as a lubricant allowing the ice to suddenly move downhill,  ... “Some of Greenland’s glaciers, as large as Manhattan and as tall as the Empire State Building, can move 10 meters in less than a minute, a jolt that is sufficient to generate moderate seismic waves.”