Mount Agung on Bali erupts

A black ash cloud rises from the top of the volcano. Source 7 News

A black ash cloud rises from the top of the volcano. Source 7 News

With Schoolies underway, thousands of students have flocked to Indonesia or are expected to fly this week.

The Mount Agung volcano on the Indonesian tourist island of Bali has spewed ash and smoke after months of activity and monitoring.

In a statement released overnight, Virgin Australia said it was "continuing to closely monitor volcanic activity" after the minor eruption but all flights are operating as normal.

'Guests with travel insurance are also encouraged to check with their insurer about their individual circumstances'.

Almost 1,600 people died when Agung last erupted in 1963, but officials said Tuesday that the rumblings did not pose an immediate threat to those living in its shadow.

A spokesperson for the national disaster agency said Mount Agung was undergoing phreatic eruptions, which happen when water beneath the ground or on the surface is heated by magma.

More than 140,000 people evacuated the region around the volcano when it was on high alert, though authorities urged those who had left areas not in the official danger zone to return home.

A view of Mount Agung in Bali September 26, 2017.

That alert was recently downgraded.

Indonesia sits on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent seismic and volcanic activity.

In 2010 Mount Merapi, considered one of the most active and unsafe volcanoes in the world, erupted and killed more than 300 people and forced 280,000 people to flee.

But the alert level has not been addressed to the extent that "it is not a rash", said the Centre for volcanology and management of geological hazards.

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