I cannot imagine how FYI could ridge to 10m thick ice. Could this be some of the last thick ice that huddled near the CAA that broke away several years ago and made a lonely journey to the ESS?
SH, this happens on occasion even in northern Baltic Sea, the trick to get a 10m thick wall of ridged ice is actually not as hard as most tend to think. You only need to wedge a somewhat thick floe, say 70cm, of say 20m in diameter, between two larger pieces of ice, at an angle. This then acts as an anchor point to the rest of the ice.
The trick is most of the wedged ice is still under water so the force making the initial ridge has not to be so strong as many would think. A strong winter storm exerting pressure on a vast field of ice behind the wedging floe can pretty easily push even a such a small floe at an angle. I've seen 10 m floes at 45 degrees over in the sea. A protrusion of 2 meters above smooth ice in pictures could have over 8 meters of ice in the ocean. No doubt some of the wedged ice can snap off the initial wedged floe so the ice-breaker captain must use his experience to estimate the true thickness of these ridges. Hope this helps.
I might add that the fact that there are few if any time-lapse videos of this process is likely due the fact that most people want to stay very closely inside in such weather and not risk losing their equipment. Likely over 15m/s winds + windblown snowcrystals would likely clog the view from a camera anyway if it's anchored strongly enough. Some o-buoy type of rig in a correct location could probably do it.
