Whillans Ice Stream

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Whillans Ice Stream, a glaciological feature of the West Antarctic Ice Sheet, formerly known as Ice Stream B, renamed in 2001 in honor of Ohio State University glaciologist Dr. Ian Whillans.
Whillans Ice Stream is one of about a half-dozen large, fast-moving rivers of ice pouring from the West Antarctic Ice Sheet into the Ross Ice Shelf. The ice stream is the subject of different glaciological studies, one of which is looking at subglacial lakes that researchers believe may be speeding the movement of the ice as they periodically fill and drain.
Other researchers, also funded by the National Science Foundation, reported in the June 5, 2008 issue of the journal Nature that from seismological and GPS data they discovered the Whillans Ice Stream releases two bursts of seismic waves every day, each one equivalent to a magnitude 7 earthquake. The data show that the river of ice moves about a half-meter within ten minutes, remains still for 12 hours, then moves another half-meter. Each time it moves, it emits seismic waves that are recorded at seismographs around Antarctica, and even as far away as Australia, a distance of more than 6,400 kilometers.

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