Mount Semeru, the highest peak on Java Island, showed volcanic activity again on Thursday (4/6/2026) morning. A report from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) noted that the eruption occurred precisely at 07:47 WIB, with a thick column of white-to-gray ash rising 700 meters above the summit.
The eruptive activity recorded on a seismogram with a maximum amplitude of 21 millimeters lasted for more than two minutes. Nevertheless, relevant authorities assured that this phenomenon remains under close monitoring, with the volcano's alert status remaining at Level III (Alert).
Responding to the situation, Lumajang Regency BPBD Pusdalops officer Nurcahyo emphasized the importance of residents adhering strictly to mitigation recommendations. He reminded the public that potential hazards such as pyroclastic flows, lava, and cold lava flows (lahars) remain real threats, especially if heavy rainfall occurs around the summit area.
Authorities have established strict restrictions to minimize risk. Activities are strictly prohibited in the southeastern sector along Besuk Kobokan up to a distance of 13 kilometers from the eruption center. Additionally, a five-kilometer radius from the crater must be evacuated due to the risk of incandescent material ejection that poses a danger to human life.
The local government urges the public not to be swayed by unverified information and to rely on official communication channels. Collective preparedness, particularly for residents living along river basins originating from Semeru, is key to disaster mitigation efforts in the region.
