Key Highlights
- Mount Lewotobi Laki‑Laki erupted on 19 May 2025, sending an ash plume 1.1 km above its summit.
- Indonesian authorities raised the volcano’s alert level to the maximum (Level 4) amid concerns of a larger eruption.
- The Volcanic Ash Advisory Center in Darwin flagged a red alert, warning airlines of significant ash hazards.
- Health advisories urged residents to wear masks, stay 3 mi (5 km) from the crater and monitor for lahars in case of heavy rain.
Detailed Insights
The twin peaks, Laki‑Laki (“man”) and the higher Perempuan (“woman”), sit on the eastern coast of Flores Island in East Nusa Tenggara. The 2025 eruption was preceded by a surge of seismic swarms the night before, prompting authorities to upgrade the alert level.
VAAC’s red alert denotes the potential for ash columns that could reach flight‑level altitudes, posing a risk of engine damage, loss of visibility and aircraft–ground conflicts. Consequently, scheduled flights to Bali and other regional hubs were disrupted.
In November 2024, a previous eruption killed nine residents and forced the evacuation of thousands. The current event underscores concerns about lahars—volcanic mudflows that can be triggered by heavy rainfall on freshly erupted ash—along with long‑term environmental damage to the surrounding rainforest.
- Rescue teams are on standby and emergency shelters have been established.
- Continuous seismic monitoring is underway to detect pre‑eruption tremors.
Key Concepts
- Laki‑Laki – The Indonesian name meaning “man,” referring to one of the twin volcanoes.
- Perempuan – The sister peak, meaning “woman,” which is slightly taller yet currently calmer.
- VAAC – Volcanic Ash Advisory Center; the body that issues aviation ash advisories worldwide.
- Lahar – A fast‑moving volcanic mudflow that combines ash, rock, and water.
- Alert Level 4 – The maximum alert stage indicating imminent large‑scale eruption and high hazard.