Urgent alert issued as Indonesia’s most active volcano shows increased activity.
YOGYAKARTA, INDONESIA , Mount Merapi, Indonesia’s most active volcano, erupted early Wednesday, October 7, 2026, sending hot clouds and pyroclastic flows southwest. The eruption occurred at approximately 1:07 AM local time (WIB). The Center for Volcanology and Geological Hazard Mitigation (PVMBG) has maintained the volcano’s alert level at III (Standby), warning residents and tourists to stay clear of designated hazard zones. This developing story highlights the persistent volcanic activity in the region.
The eruption involved pyroclastic flows that traveled up to 1.6 kilometers towards the Kali Krasak (Krasak River). The specific event was registered on seismographs with a maximum amplitude of 3 mm and a duration of 23.5 seconds. While no visual eruption was observed, seismic monitoring recorded multiple earthquakes and tremors, indicating ongoing internal activity. The PVMBG advises against any activities within a 3-kilometer radius of the Verbeek Crater eruption center.
Immediate Details of the Eruption
The latest eruption of Mount Merapi on October 7, 2026, at 1:07 AM WIB, saw pyroclastic flows descend towards the Kali Krasak. These flows, a dangerous mix of hot gas, ash, and rock fragments, are a primary concern for the region. The Geological Disaster Technology Research and Development Center (BPPTKG) reported that the flows had amplitudes between 18-33 mm and durations of 175-188 seconds. In addition to the pyroclastic flows, the volcano also recorded 49 avalanche earthquakes and 14 hybrid earthquakes during the same observation period. This seismic activity underscores the continuing unrest beneath the volcano.
Authorities have emphasized that Mount Merapi remains at Alert Level III, known locally as “Siaga” or Standby. This level indicates heightened activity and a significant probability of further eruptions. While no mass evacuations have been ordered, residents are strongly urged to remain outside of exclusion zones, particularly along river valleys like Boyong, Krasak, and Bebeng, where mudflows and rock avalanches can be triggered by heavy rains.
Context and Background of Mount Merapi
Mount Merapi, located on the border of Central Java and Yogyakarta provinces, is one of Indonesia’s most active volcanoes. It erupts regularly, with its most significant recent eruption occurring in 2010, which caused widespread devastation and hundreds of fatalities. The volcano’s current eruptive phase, characterized by lava dome growth and collapse, has been ongoing since late 2020. This activity generates frequent lava avalanches and pyroclastic flows, posing a continuous threat to surrounding communities.
The volcano’s steep slopes and the accumulation of viscous lava at its summit make it prone to dome collapses. These collapses can produce incandescent lava avalanches and dangerous pyroclastic flows, which are fast-moving currents of hot gas, ash, and rock. The hazard zones around Merapi extend several kilometers down its slopes, with specific dangers identified along rivers like Boyong, Bedog, Krasak, Bebeng, Woro, and Gendol.
Current Situation and Ongoing Developments
As of October 7, 2026, Mount Merapi remains active with continuous seismic monitoring. The PVMBG reports ongoing magma supply beneath the volcano, suggesting that further lava dome growth, collapses, and pyroclastic flows are possible. While the specific eruption early this morning was registered seismically, no significant visual ash plume was observed. However, the alert level remains at III (Standby), a status that has been in place for months without change.
Authorities are actively monitoring the situation and warning against entering designated hazard areas. The current hazards include lava avalanches and pyroclastic flows that can extend up to seven kilometers from the summit along certain river drainages. The BPPTKG continues to issue regular updates on the volcano’s activity, emphasizing the need for public vigilance.
Reactions and Expert Commentary
The Indonesian Geological Agency (BPPTKG) is the primary source of official information regarding Mount Merapi’s activity. Head of BPPTKG, Agus Budi Santoso, has repeatedly urged the public to stay away from hazardous areas and adhere to safety protocols. Social media has seen reports of the eruption, though authorities have also had to debunk fabricated claims of mass evacuations, stressing that routine life continues outside the exclusion zones.
Volcanologists emphasize the consistent magma supply beneath Merapi, which fuels its ongoing dome-building and collapse cycle. This cyclical activity is typical for Merapi, making it one of the world’s most closely monitored volcanoes.
What’s Next
The alert level for Mount Merapi is expected to remain at Level III (“Siaga”) as long as current activity persists. The BPPTKG will continue its intensive monitoring, analyzing seismic data, dome growth, and potential flow paths. Residents and visitors are strongly advised to follow all official warnings and evacuation directives should they be issued. The long-term implications involve continued risk assessment and preparedness strategies for the communities living in close proximity to this highly active volcano, a constant reminder of Indonesia’s position on the Pacific Ring of Fire.
This is a developing story. We will provide updates as more information becomes available.
