Key Highlights
- On 11 January 2025, Mount Ibu expelled ash to an altitude of roughly 4 km and projectile lava that travelled about 2 km from the vent.
- Authorities demarcated a 4‑km exclusion circle and a 5.5‑km northern danger sector, urging residents to don masks and eye protection.
- The volcano remains at Alert Level III, with intermittent activity recorded since June 2024, including days with more than 70 eruptions.
- An orange‑level VONA was released, flagging ash‑related hazards for air traffic in the region.
- Continuous coordination with the PVMBG is advised for real‑time risk management.
Detailed Insights
The eruption began at 19:35 local time and persisted for 3 minutes 5 seconds. An ash plume rose to approximately 4,000 m, while incandescent lava fragments were hurled up to 2 km from the crater rim. In response, the disaster management agency instituted a four‑kilometre radius exclusion zone surrounding the summit and a 5.5‑kilometre sector to the north of the active vent. Public advisories stress the use of particulate‑filtering masks and protective goggles to mitigate respiratory and ocular irritation caused by airborne ash.
Mount Ibu sits on Halmahera Island, part of Indonesia’s North Maluku province, within the Pacific “Ring of Fire.” The archipelago hosts 127 active volcanoes, rendering it one of the world’s most volcanically volatile regions. Since mid‑2024, Ibu’s activity has fluctuated, with some intervals witnessing up to 70 eruptive episodes in a single day, underscoring its volatile nature.
The Centre for Volcanology and Geological Hazard Mitigation (PVMBG) issued an orange‑level Volcano Observatory Notice for Aviation (VONA), alerting airlines to potential engine‑damage risks from volcanic ash. Pilots are urged to avoid the defined airspace and to monitor updates continuously.
Key Concepts
- Exclusion Zone: A legally enforced perimeter that restricts public entry to protect individuals from immediate volcanic hazards.
- Alert Level III (Alert): A classification indicating that a volcano is actively erupting or showing signs of imminent activity, requiring heightened vigilance.
- VONA (Volcano Observatory Notice for Aviation): An official bulletin that communicates volcanic ash threats to the aviation community, assigning colour‑coded risk levels.