White steam rose hundreds of metres out of the Mount Sinabung’s peak earlier today as locals looked on, taking pictures.
It has become a regular occurrence for the volcano in Karo, Indonesia, which began erupting in 2010 after lying dormant for four centuries.
Since then Sinabung has regularly spit hot ash into the air, and has often spewed lava.
Last year seven people were killed in a particularly violent eruption.
There is now a 7km exclusion zone around the volcano and the threat level is at its maximum.
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On the Indonesian island of Bali, another volcano, Mount Agung, has been threatening to blow for weeks.
An eruption was said to be “imminent” on Friday September 22, when the alert level was raised to the highest possible.
An exclusion zone extends up to 12km around Agung, with locals living in temporary shelters.
More than 180,000 have since been evacuated, but as of yet there has not been any eruption.
Hundreds of earthquakes continue to be recorded around the volcano every day – usually a sign that magma is moving upwards.
Yesterday alone there were 788 tremors, of which 270 were shallow quakes, 474 were deep quakes and 44 were local tectonic tremors.
Over the weekend fears grew that an eruption truly was imminent, when a magnitude 4.6 quake was recorded – the most powerful since the threat level was raised.
The Balinese Government has extended a state of emergency until October 26 as seismic activity under the volcano increases.
However volcanologists have said that it is impossible to predict when Agung will erupt.
Dr Janine Kripper, who has been translating Indonesian reports on Mount Agung on Twitter, says that an eruption is “more likely than not”.