I toured the pressure ridges by Scott Base a few days ago and was able to shoot a few pictures. The Ross Ice shelf, which ranges from 50 to 200 meters in thickness is supposedly advancing about 9 feet every day due to the glacial flow from the mountains above which feed it.

The McMurdo ice shelf, much smaller in size and less active, sits nestled in behind hut point peninsula and is actually what we were standing on during the tour.

The pressure from the Ross shelf is not directly aimed into the McMurdo shelf, but acts more like a shear zone. This pressure is what forms the giant rollers, which eventually crack and can expose sea water in some places.

~G