Less than 50%

Pictured from a passenger plane: Menacing 12-mile-high ash cloud looms over Indonesia's 'Mountain of Spirits' after volcano erupts

The volcano sits in Indonesia's notorious 'Ring of Fire' - an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. It has 452 volcanoes - 75 per cent of the world's total.

Since Sangiang Api's first recorded eruption in 1512, it is believed to have erupted a total of 20 times.

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Many airports are closed with air traffic disruptions including Darwin and other airports in Northern Australia