Antarctica's biggest ice shelf is on the move and could trigger icequakes, a new study warns. Researchers found that the Ross Ice Shelf – a platform of ice measuring nearly 200,000 square miles, just shy of the size of France – jumps suddenly twice a day. The sudden 'slip' is caused by two sections of ice moving against each other, a bit like the movement of plate tectonics that cause earthquakes.

The study was led by Professor Doug Wiens, a geophysicist at Washington University in St. Louis, Missouri and published in Geophysical Research Letters.