posted on Jun, 5 2008 @ 12:59 PM
WASHINGTON: Seismologists have found seismic signals from a giant river of ice in Antarctica, each one equivalent to a magnitude of seven
The signals have been found by Douglas A. Wiens from Washington University, and colleagues at Pennsylvania State University and Newcastle University
in the United Kingdom.
They combined seismological and global positioning system (GPS) analyses to reveal the two bursts of seismic waves from an ice stream in Antarctica
every day, each one equivalent to a magnitude seven earthquake.
The ice stream is essentially a giant glacier 60 miles wide and one-half mile thick.
The data shows that the river of ice moves about 18 inches within ten minutes, remains still for 12 hours, then moves another eighteen inches. Each
time it moves, it gives off seismic waves that are recorded at seismographs all around Antarctica, and even as far away as Australia.
Seismic waves from what are loosely called "glacial earthquakes" mainly near Greenland were originally reported in 2003, and the numbers have been
increasing in recent years.....more..
- That must be one heck of a sound when that stream slips that 18 inches.. but it's not great news that this is happening all the time now.