While it’s impossible to predict the exact timing of the collapse, observations in August and September showed that the glacier was shifting at a speed of 50 to 60 centimeters (20 to 24 centimeters) a day, experts said.
He added that a glacier collapse would not threaten residential areas or tourist facilities.
With 11 peaks above 4,000 meters (13,123 feet) between Italy and France, Mont Blanc is Western Europe’s highest mountain range and is popular with hikers, climbers and skiers.
Alpine glaciers are melting as a result of rising global temperatures.
During the same period, the number of glaciers decreased from 1,381 to 903.