75,000 evacuated from from Bali volcano

More than 57,000 people have been evacuated from around Bali's Mt Agung amid eruption fears. (AAP)

More than 75,000 people have been evacuated from around Mount Agung in Bali because of the risk of a volcanic eruption.

More than 75,000 people have fled the Mount Agung volcano on Indonesian's tourist island of Bali because of fears of an eruption.

Indonesia's disaster agency spokesman, Sutopo Purwo Nugroho, said evacuees are spread across more than 370 locations on Bali and their numbers are continuing to rise.

The volcano's alert status was raised to its highest level on Friday, with hundreds of tremors daily indicating a high chance it will erupt.

An increasing frequency of tremors from the volcano indicates magma is continuing to move toward the surface and an eruption is possible, Nugroho said.

He said more than 560 volcanic earthquakes were recorded on Monday, most of them shallow.

The evacuees are living in temporary shelters, sports centres, village halls and with relatives or friends. Some return to the danger zone, which extends up to 12 kilometres from the crater, during the day to tend to livestock.

Officials have said there's no immediate threat to tourists, but some are already cutting short their stays in Bali. A significant eruption would force the closure of Bali's international airport, stranding thousands.

"It's obviously an awful thing. We want to get out of here just to be safe," said an Australian woman at Bali's airport who identified herself as Miriam.

Nugroho said hundreds of thousands of face masks will be distributed in Bali as part of government humanitarian assistance that includes thousands of mattresses and blankets.

"The chances of an eruption are very high, but we cannot be sure when it will erupt," he said at a news conference in the capital, Jakarta.

In 1963, Agung hurled ash as high as 20km and remained active about a year. Lava travelled 7.5 kilometres and ash reached Jakarta, about 1,000 kilometres away.

The mountain, 72km to the northeast of the tourist hotspot of Kuta, is among more than 120 active volcanoes in Indonesia.

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