Indonesia is managing a wave of volcanic activity in September 2026, with eruptions at Mount Ile Lewotolok, Mount Semeru, Mount Sinabung, and Mount Anak Krakatau disrupting local communities, forcing shelter evacuations for hundreds of villagers, and temporarily closing six key airports across the country.
Indonesia sits squarely along the Pacific Ring of Fire, a region home to roughly 500 volcanoes, of which 127 are classified as active. As the country entered September 2026, multiple peaks synchronized their geological activity in rapid succession, creating severe operational hurdles for regional aviation and local populations. The activity spanned several islands, drawing immediate disaster management responses from federal and regional authorities.
Mount Anak Krakatau Triggers Major Airport Closures Across Greater Jakarta and Lampung
Mount Anak Krakatau captured the most intensive public concern following continuous eruptions that began on the night of Friday, September 4, 2026. While the heaviest phase of activity concluded early Sunday morning, the resulting volcanic ash drifted widely across Greater Jakarta, Banten, and Lampung, creating immediate hazards for commercial aviation.
By 1:00 p.m. Western Indonesia Time on Sunday, September 6, 2026, six key airports were temporarily closed to maintain safety. The affected facilities included Soekarno-Hatta International Airport and Budiarto Airport in Tangerang, Pondok Cabe Airport in South Tangerang, Halim Perdanakusuma International Airport in East Jakarta, Radin Inten II Airport in Lampung, and Husein Sastranegara International Airport in Bandung, West Java.
Operations at Soekarno-Hatta International Airport absorbed the brunt of the disruption. Yudistiawan, the assistant deputy of communication and legal at Soekarno-Hatta International Airport, reported that 1,039 flights were affected by the ashfall on Sunday alone. That total included 746 domestic flights, 272 international flights, and 21 cargo flights, leaving a cumulative total of 166,351 passengers dealing with cancellations, delays, and diversions.
According to the National Disaster Mitigation Agency (BNPB), the districts most severely impacted by Mount Anak Krakatau’s ashfall are South Lampung and Tanggamus in Lampung Province, alongside Pandeglang in Banten Province, where schools transitioned to remote learning.
Mount Sinabung Erupts on Sumatra Island and Promotes Level III Standby Status
On Sumatra island, Mount Sinabung produced a major eruption on Monday morning, August 31, 2026, sending a dense column of black ash and smoke rising approximately 3.5 kilometers (11,482 feet) above its peak. The initial blast left roads, vehicles, and buildings in several local villages covered in a layer of gray ash.
Following the activity, officials raised the volcano’s alert level to Watch,
representing the second-highest level for volcanic activity, while the BNPB elevated Sinabung’s status to Level III (Standby). Lana Saria, chief of Indonesia’s Geological Agency, noted in a statement that This eruption is considered an initial eruption, and it is possible that a larger eruption could occur,
as reported by Associated Press.
The Geological Agency previously tracked visual indicators of heightened activity in mid-August, including dozens of earthquakes. Local authorities subsequently expanded the safety exclusion zone around the 2,600-meter (8,530-foot) mountain, advising residents, visitors, and tourists to refrain from activities within a 6-kilometer radius of the summit. Over the past few years, approximately 30,000 residents have been forced to evacuate their homes around Sinabung due to persistent volcanic hazards.
Evacuations and Response Measures Across Karo and Simpang Empat Sub-districts
The intensification at Mount Sinabung prompted direct operational interventions from regional and national disaster management teams. Berton S.P. Panjaitan, acting head of disaster data, information, and communication center at the BNPB, explained that ashfall heavily impacted residential areas and agricultural lands in Ndokum Siroga and Kuta Tengah villages within Simpang Empat Sub-district, as well as Payung Village in Payung Sub-district.
Local authorities implemented targeted emergency measures to safeguard civilians living in the shadow of the volcano. Joint rescue teams evacuated at least 615 villagers to designated safe shelters, supported by a deployment of 1,279 personnel. Local authorities distributed protective masks to residents to protect themselves.
Karo Regency authorities implemented structured precautions for students in the hazard zones.
Activity at Mount Ile Lewotolok and Mount Semeru
Beyond Anak Krakatau and Sinabung, Indonesia’s ongoing volcanic surge included activity at Mount Ile Lewotolok in East Nusa Tenggara and Mount Semeru in East Java.
Mount Ile Lewotolok recorded a frequency of explosions, erupting 1,873 times between September 1 and 5, 2026, with ash plumes reaching heights between 200 and 700 meters from the summit. The sequence persisted on Monday morning with two additional eruptions at 05:41 a.m. and 06:15 a.m. local time, which sent ash columns approximately 600 meters above the peak.
Meanwhile, Mount Semeru erupted on Sunday morning, September 6, 2026, sending an ash column 1,000 meters above its summit. That event triggered an immediate regional safety restriction, prohibiting public access within a five-kilometer radius of Semeru’s crater due to the danger of ejected incandescent rock.
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