rockfall

[ rok-fawl ]

/ ˈrɒkˌfɔl /

an act or instance of the falling of rock, as in a cave-in or an avalanche.

a mass of rocks that have fallen: to be trapped under a rockfall.

Origin of rockfall

First recorded in 1920–25; rock¹ + fall

On April 25, 2006, the tremor triggered a rockfall inside a gold mine, and three of the 17 miners were unable to escape.

The Bangladesh Factory Collapse Survivor and More Miraculous Rescues (VIDEO) |Holly Bernal, Ben Teitelbaum |May 10, 2013 |DAILY BEAST
He set about skirting the rockfall, still searching the ground for traces of beetle wheels.

World of the Drone |Robert Abernathy
Indeed, he had helped to clear the rockfall which crushed the life out of the unfortunate miner.

The Terms of Surrender |Louis Tracy
They followed the yellow beam of Scotty's flashlight through the dark tunnel to the rockfall.

The Blue Ghost Mystery |Harold Leland Goodwin