 Even though no Plinian eruptions are recognized, even Peléan eruptions may possibly create large amounts of volcanic ash that will possibly affect these close by villages.Ash columns from the volcanoes might rise hundreds of metres and could make this a serious hazard for air traffic.The unstable lava formation of The Barrier has in the past unleashed several debris flows in the area below the lake, most recently in 1855-56 forming a large boulder field which gives Rubble Creek its name.