According to the Centre for Volcanology and Geological Hazard Mitigation (CVGHM), the latest eruption occurred at 8.59 am local time.
Volcanologist Devy Kamil Syahbana said Tuesday that the chunk, known as the "lava dome", had a volume of at least 1.6 million cubic metres. A volcano erupted on Mount Sinabung.
The Mount Sinabung volcano on Indonesia's Sumatra island erupted on Monday causing clouds of ash to reach heights of 5,000 kilometers prompting Indonesia to raise aviation warnings.
An ash cloud from Mount Sinabung volcano rises in Karo, North Sumatra Province, Indonesia February 19, 2018 in this still image taken from a social media video. Interestingly, Mount Sinabung had been inactive for four centuries before the 2010 volcanic eruption. Sinabung is one of the most active volcanos in Indonesia. In 2014, When Sinabung erupted, over dozen people were killed and thousands evacuated.
Cars are left covered in ash from the volcano.
The proposal was warmly embraced by self-styled extreme adventurer Karl Kaddouri, a French hotel worker in Bali who just weeks before had defied warnings and scaled a rumbling Mount Agung on the brink of eruption.
"The ash has not reached Medan city and the airport", he said, referring to Kualanamu worldwide Airport in North Sumatra province.
A major volcanic eruption in Indonesia has propelled ash and rock more than 5,000m (16,400ft) into the sky. The island nation is near the Pacific "Ring of Fire" - an area in the Pacific Ocean that's prone to volcanic activity and earthquakes.