AUTHORITIES are closely monitoring Mount Sinabung on Sumatra after placing in at the highest alert level last week.
Hot ash tumbled down Sinabung's slopes up to 2.5km from its smouldering mouth, government volcanologist Surono says.
He is urging villagers to stay out of the main danger zone, which stretches 7km to the southeast of the crater.
No injuries have been reported.
"The growing size of the lava dome is very unstable," said Surono, who goes by one name, adding that smouldering rocks mixed in with hot gases may tumble down at any time.
The volcano in North Sumatra province has been shooting smoke and ash more than 500m into the air since Monday.
Authorities counted more than 50 separate eruptions early on Wednesday, but said villages outside the evacuated area are not in immediate danger.
Mount Sinabung is among about 130 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific Ring of Fire, an arc of volcanoes and fault lines encircling the Pacific Basin.
The 2600m Mount Sinabung has sporadically erupted since 2010, after being dormant for 400 years.
An eruption last year killed at least 17 people.
More than 2700 people were evacuated from villages around the crater into several temporary shelters.
AAP
[themercury.com.au]
20/6/15
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Authorities have been closely monitoring 2,460-meter-high Mount Sinabung in North Sumatra province since June 2, when its status was raised to the highest alert level due to the growing size of its lava dome.
Wendy Cahya, an official at the mountain's monitoring post, says hot ash tumbled down the slopes of the mountain as far as 3 kilometres southeastward on Saturday.
Mount Sinabung is among about 130 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific "Ring of Fire."
The volcano has sporadically erupted since 2010, after being dormant for 400 years. An eruption last year killed at least 17 people.
AP
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Before 2010, the volcano had been dormant for more than 400 years.
At least 3,000 people living near its slopes have had to leave, including 1,200 on Monday alone.
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15/6/15