In September 2017, the area experienced 844 volcanic earthquakes, peaking at 300 to 400 earthquakes on 26 September.
The frequency and intensity of these quakes caused much alarm among seismologists, as similar volcanoes have historically been known to erupt with even fewer warning signs.
The alert level was raised to the highest level and about 122,500 people were evacuated from their houses around the volcano.
The Indonesian National Disaster Management Authority declared a 12-kilometre exclusion zone around the volcano on 24 September.
Evacuees gathered in sports halls and other community buildings around Klungkung, Karangasem, Buleleng, and other areas.
By late October 2017, the activity of the volcano decreased significantly, leading to lowering of the highest status of emergency on 29 October.

On 21 November, activity increased once again.
A phreatic eruption took place, with the ash cloud top reaching 3,842 metres (12,605 ft) above sea level.
Thousands of people immediately fled the area, and over 29,000 temporary refugees were reported to be housed in over 270 locations nearby.
Early on Saturday 25 November a magmatic eruption began.
The resulting eruption plume was reported to rise about 1.5–4 km above the summit crater, drifting towards the south and dusting the surroundings with thin layer of dark ash, leading some airlines to cancel flights bound for Australia and New Zealand.
An orange glow was later observed around the crater at night, suggesting that fresh magma had indeed reached the surface.
On 26 November 2017, another eruption occurred, the second in less than a week.
Ngurah Rai International Airport was closed 26 November 2017, leaving many tourists stranded.
Lahars were reported in the Selat district south of the volcano.
More than 100,000 people in a 10 km (6 mi) radius of the volcano were ordered to evacuate.
Australia's Bureau of Meteorology reported on 27 November that ash from the eruption had been observed at an altitude of 9,144 m. By the beginning of December, the eruption reduced to minor emissions of steam and smoke.
On 12 December, a picture of the crater was taken showing a steadily growing lava dome occupying approximately one third of the crater.

In June 2018, Agung erupted with 2 km high plumes interrupting air traffic.
On 3 July, a Strombolian explosion occurred, sending debris in all directions.
In late May 2019 an eruption spewed lava and rocks over about 3 km, with some ash fall on nearby villages and temporarily interrupting international flights.
In September 2017, the area experienced 844 volcanic earthquakes, peaking at 300 to 400 earthquakes on 26 September. The frequency and intensity of these quakes caused much alarm among seismologists, as similar volcanoes have historically been known to erupt with even fewer warning signs. The alert level was raised to the highest level and about 122,500 people were evacuated from their houses around the volcano. The Indonesian National Disaster Management Authority declared a 12-kilometre exclusion zone around the volcano on 24 September. Evacuees gathered in sports halls and other community buildings around Klungkung, Karangasem, Buleleng, and other areas. By late October 2017, the activity of the volcano decreased significantly, leading to lowering of the highest status of emergency on 29 October.
On 21 November, activity increased once again. A phreatic eruption took place, with the ash cloud top reaching 3,842 metres (12,605 ft) above sea level. Thousands of people immediately fled the area, and over 29,000 temporary refugees were reported to be housed in over 270 locations nearby. Early on Saturday 25 November a magmatic eruption began. The resulting eruption plume was reported to rise about 1.5–4 km above the summit crater, drifting towards the south and dusting the surroundings with thin layer of dark ash, leading some airlines to cancel flights bound for Australia and New Zealand. An orange glow was later observed around the crater at night, suggesting that fresh magma had indeed reached the surface. On 26 November 2017, another eruption occurred, the second in less than a week. Ngurah Rai International Airport was closed 26 November 2017, leaving many tourists stranded. Lahars were reported in the Selat district south of the volcano. More than 100,000 people in a 10 km (6 mi) radius of the volcano were ordered to evacuate. Australia's Bureau of Meteorology reported on 27 November that ash from the eruption had been observed at an altitude of 9,144 m. By the beginning of December, the eruption reduced to minor emissions of steam and smoke. On 12 December, a picture of the crater was taken showing a steadily growing lava dome occupying approximately one third of the crater.
In June 2018, Agung erupted with 2 km high plumes interrupting air traffic. On 3 July, a Strombolian explosion occurred, sending debris in all directions. In late May 2019 an eruption spewed lava and rocks over about 3 km, with some ash fall on nearby villages and temporarily interrupting international flights.
Mount Agung