So far this summer, there have been serious rockfall incidents on many of the iconic and/or well-traveled routes around the Mont Blanc Massif.
In August, a fairly significant rockfall event on the Gouter Route's Grand Couloir led to its temporary closure. Boulders rolled down the couloir steadily. Some even made it over the approach ridge, and nearly rolled into the camp ground by the Tete Rousse hut. Signs were posted - warning people of the danger. Many guide agencies cancelled trips, chose to run summits on the Trois Sommet route on Mont Blanc, or chose other mountains all together. I worked a trip for Mont Blanc guides that ended up climbing the Grand Paradiso in Italy, rather than face the risks on Mont Blanc during the late August heat wave.
Another rockfall incident in August - this time to the left of the Gervasutti Buttress on the Mont Blanc du Tacul - deposited a house-sized block of granite on the glacier of the Vallee Blanche. At similar time, a cabin-sized chunck fell off the Eperon de Cosmiques on the Aiguille du Midi south face.
On September 11th, two large rock fall events took place on the Petit Dru - on or near the famed Bonatti Pillar rock fall of 1997 and 2003.
Yesterday I climbed Mont Blanc via the Trois Sommet route. On our return journey up the snow arete into the Aiguille du Midi cable car station, My guest Doug and I witnessed several washing machine sized boulders rolling down the couloir to the right of the Eperon de Cosmiques. The rock fall originated very close to the bottom of the 20 meter rappel midway up the Arête des Cosmiques. I don't know if it was human-triggered or natural. The above-average temperatures we've had lately could permit either option. The boulders rolled out across the approach path to the Cosmiques hut - some making it to within 50 meters of the tents often found in that area. The rocks could have killed anyone on the path (including us - we had been in that spot 15 minutes previosly...).
Be careful out there!