The volcano erupted on Saturday on a smaller scale, spewing lava, belching ash several kilometres into the night sky, and causing lightning.
The alert level remained at the second-highest of a four-tiered system on Monday after authorities raised it last week, with an exclusion zone between three and five kilometres (two to three miles) around the volcano’s crater.
Ibu is one of Indonesia’s most active volcanos, erupting more than 21,000 times last year.
Geology Agency official Sofyan Primulyana said Ibu recorded an average of 58 eruptions per day in 2023.
Indonesia, a vast archipelago nation, experiences frequent seismic and volcanic activity due to its position on the Pacific “Ring of Fire”.
Last month, Mount Ruang in North Sulawesi province erupted more than half a dozen times, forcing thousands of residents of nearby islands to evacuate and it remains at the highest alert level.
All of the 800 or so residents of Ruang island will be permanently relocated.
