Once a lake is saturated with CO2, it is very unstable, but a trigger is needed to set off an eruption. In the case of the 1986 Lake Nyos eruption, landslides were the suspected triggers, but a volcanic eruption, an earthquake, or even wind and rain storms are potential triggers. Another possible cause of a limnic eruption is gradual gas saturation at specific depths which can trigger spontaneous gas development. For any of these cases, the trigger pushes some of the gas-saturated water higher in the lake, where pressure is insufficient to keep CO2 in solution. As bubbles start forming the water is lifted even higher in the lake (buoyancy), where yet more CO2 comes out of solution. This process forms a column of gas, at which point the water at the bottom of this column is pulled up by suction, and it, too, loses CO2 in a runaway process. This eruption discharges CO2 into the air and can displace enough water to form a tsunami.