The vast volcano, known as the Son of Krakatoa, is spewing lava into the air as the region is hit by another natural disaster.
Lava is also running down the volcano’s slopes as the region reels from the devastation left by a magnitude 7.5 earthquake and consequent tsunami on the Sulawesi island last Friday.
Sutopo Purwo Nugroho, Head of Indonesian National Board for Disaster Management tweeted about the eruption, assuring people it was not a cause for concern.
He said: “Mount child of Krakatoa erupted almost daily.
“On 2/10/2018 156 eruptions occurred, throwing sand and ash, incandescent lava.
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“The volcano’s condition is safe if it is outside the radius of 2 km from the crater.
“Interesting to see the tourist phenomenon the mountain erupted in a safe place.”
Indonesia is located in the Ring of Fire region, one of the worst affected areas by earthquakes in the world.
The volcanic zone is home to 452 volcanoes.
The region also has a series of oceanic trenches, volcanic arcs, volcanic belts, and tectonic plate movements, which make it extremely prone to earthquakes and tsunamis.
Just minutes before the Son of Krakatoa erupted in Java, Mount Soputan, a volcano on Sulawesi island also started to erupt.
Mount Soputan erupted on Wednesday morning at 8.47am local time (2.57am BST), with ash billowing in the sky as high as 5,809 metres above sea level.
In a warning to the affected region, The Regional Disaster Management Agency (BNPB) said: “The community should not have activities in all areas within a 4km radius of the peak of Mount Soputan and within the sectoral expansion area to the west-south-west direction as far as 6.5km from the peak which is a crater opening area to avoid the potential threat of lava and hot clouds.”
The death toll from Friday’s catastrophic 7.5 earthquake has reached at least 1,350, but the number is predicted to rise.
Aid supplies are starting to arrive in the city of Palu, which was engulfed by a tsunami as a result of the ensuing tremors.
Police are guarding shops from looters as tensions in the area rise.