Roy Bangun, 41, said: "The residents are scared, many are staying indoors to avoid the thick volcanic ash."
Last Tuesday, Mount Sinabung in North Sumatra province sent volcanic materials as high as 16,400 feet into the sky and deposited ash on nearby villages.
Authorities recorded at least 13 times when it released ash clouds.
There had been no fresh evacuations due to the activity and no reports of disruptions to flights in the region.
The 8,530-feet Sinabung was dormant for four centuries before erupting in 2010, killing two people. Another eruption in 2014 killed 17 people, while seven died in a 2016 eruption.
The volcano, one of two currently erupting in Indonesia, has sporadically come to life since then.
Muhammad Nurul Asrori, a Sinabung monitoring officer, said Tuesday's volcanic debris was the largest he had seen since 2010.
"The large lava dome at any time could burst, causing a bigger avalanche of hot clouds," he said.
Some 30,000 people have been forced to leave homes around Sinabung in the past few years.
The Associated Press contributed to this report.