Largest prehistoric landslide

The largest known prehistoric landslide is the Green Lake Landslide, which occurred around 13,000 years ago in modern-day New Zealand and saw 27 cubic kilometres (6.4 cubic miles) of the North Island's Hunter Mountains collapse. It was believed to have been caused by an earthquake.

There are claims that 130–160 km3 (31–38 cu mi) of rock slid from a volcano into the sea on Fogo Island in Cape Verde in the Atlantic Ocean some 73,000 years ago, causing a mega-tsunami. But the question of whether or not this occurred in a single event, or over the course of several events over many years, remains a matter for debate.