Volcanic activity at Mount Semeru, the highest mountain on Java Island, has surged again, recording four eruptions within a single day on Wednesday (1/7/2026). This phenomenon caused volcanic ash spews to reach a maximum height of one kilometer above the summit, which stands at 3,676 meters above sea level (masl).
According to reports from the Mount Semeru Observation Post, the series of eruptions began in the early morning at 00:52 WIB and continued through the morning at 08:14 WIB, 09:24 WIB, and 10:10 WIB. The eruption intensity generated thick white-to-gray ash columns blowing toward the east, southeast, and south of the mountain.
To date, the Lumajang Regional Disaster Management Agency (BPBD) stated that there have been no reports of significant impacts from volcanic ash fall in residential areas. Nevertheless, local authorities emphasized the importance of public adherence to established safety protocols.
Currently, Mount Semeru remains at Alert Status Level III (Siaga). Residents are strictly prohibited from conducting activities within a five-kilometer radius of the main crater due to the threat of incandescent rock projectiles. Additionally, the public is advised to stay away from the Besuk Kobokan area and river channels originating from Semeru's peak up to designated distances to anticipate the threat of hot pyroclastic flows and cold lava flows.
