Authorities have expanded the danger zone around the volcano.
Jetstar flights from Australia to Bali were cancelled on Friday morning, but resumed by the afternoon "as conditions have improved", the airline said.
Two Virgin Australia flights scheduled to depart Friday morning were also rescheduled for the afternoon.
The volcano on the remote island of Flores in East Nusa Tenggara province has had hundreds of earthquakes and visible volcanic activity has significantly increased in the last seven days.
An eruption followed by an explosion was heard Thursday evening as far away as Larantuka and Maumere, two cities about 50km to 85km from the volcano. The eruption was recorded at several monitoring stations on Flores island, Muhammad Wafid, chief of Indonesia's Geology Agency, said in a statement.
There were two other eruptions, and smaller activity occurred during the day Friday. Smoke blew around the crater with weak to moderate pressure, and firelight was seen at the peak, indicating the glowing volcanic material was at a shallow depth.
On Friday, the volcano was still spewing thick, grey clouds from the crater.
The ash from the eruptions also covered streets and plantations. Some residents tried to clear the streets of ash and fallen trees using simple tools, such as shovels and hoes.
A number of residents were injured by hot dust from the eruptions.
"They were all guarding the cornfield when the volcano erupted. And when they ran together with the hot lava that started to fall, it injured their legs and backs." said Maria Magdalena, a resident of Nurabelen village in East Flores district.
Authorities raised the eruption alert to the highest level and expanded the danger zone from 7km to 8km from the crater. No new evacuations were ordered.
"We are still waiting for instructions from the government to evacuate," said a resident, Paulina Telesiku.Â
Several airlines canceled flights between Australia and Indonesia's tourist island of Bali, while other international and domestic flights to the island have been delayed.
Residents were warned to be vigilant about heavy rainfall triggering lava flows in rivers originating from the volcano, Indonesia's geology agency said in a statement.
An eruption of Mount Lewotobi Laki Laki in November killed nine people and injured dozens.
The 1584m mountain is a twin volcano with Mount Lewotobi Perempuan in the Flores Timur district.
Indonesia is an archipelago of 270 million people with frequent seismic activity. It has 120 active volcanoes and sits along the "Ring of Fire," a horseshoe-shaped series of seismic fault lines encircling the Pacific Basin.
