Overview
- Indonesia’s geology agency escalated Semeru to the top alert level after multiple eruptions and sustained activity.
- Satellite and advisory centers reported an ash column reaching about 16.5 km (54,000 ft) and issued a red aviation warning.
- Pyroclastic density currents raced down the southeastern drainage, with runouts reported around 7 to 8.5 km from the summit.
- Authorities evacuated more than 300 residents in Lumajang district to shelters, and no casualties were reported.
- Officials expanded exclusion zones, including 8 km along Besuk Kobokan and a 2.5 km summit radius, and warned people to stay away from riverbanks and downstream valleys.