en.malanginspirasi.com – As Mount Semeru erupted again on Thursday morning, June 4, 2026, the status of the highest volcano on Java Island remains at Level III (Alert).
Meanwhile its volcanic activity continues to be intensively monitored by volcano observers.
According to a report from the Center for Volcanology and Geological Hazard Mitigation (PVMBG), the eruption occurred at 7:47 a.m. Western Indonesian Time (WIB).
The ash column was observed reaching a height of approximately 700 meters above the summit, or 4,376 meters above sea level, and was white to gray in color and thick, oriented southwestward.
Eruptive activity was also recorded on a seismogram with a maximum amplitude of 21 millimeters and a duration of approximately 2 minutes and 4 seconds.
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Although the eruption is still ongoing, it is considered to be within the volcanic activity pattern, which is being continuously monitored by officials.
Therefore, the primary focus at this time is on public compliance with mitigation recommendations and the established danger zone boundaries.
Nurcahyo, an officer from the Disaster Management Operations Control Center (Pusdalops) of the Lumajang Regency Regional Disaster Management Agency (BPBD), emphasized that Mount Semeru’s status remains at Level III (Alert), urging the public to remain vigilant.
“The most important thing right now is for the public to remain disciplined in observing the designated danger zones. Semeru’s status remains at Alert, so people must remain vigilant about the potential for hot clouds, lava flows, and lahars, especially during rain in the summit area,” Nurcahyo said in a statement received on Thursday (June 4, 2026).
According to him , PVMBG in collaboration with the BPBD and various related parties continues to intensively monitor Mount Semeru’s activity to ensure any developments in volcanic activity are detected as early as possible.
“The public does not need to panic, but they must remain vigilant. Follow information from official government sources and avoid being easily influenced by unverified information. Preparedness is a crucial part of disaster risk reduction efforts,” he added.
PVMBG Recommendations
PVMBG recommends that the public refrain from activities in the southeastern sector along Besuk Kobokan and within 13 kilometers of the summit, the epicenter of the eruption.
Furthermore, the public is asked to refrain from activities within a 500-meter radius of the riverbank along Besuk Kobokan due to the potential for expansion of pyroclastic flows and lava flows up to 17 kilometers from the summit.
Residents are also advised to refrain from activities within a five-kilometer radius of the crater or summit of Mount Semeru due to the potential for ejection of incandescent material.
Vigilance is also being heightened for the potential for pyroclastic flows, lava flows, and lava flows along rivers and valleys that originate on Mount Semeru, especially in the areas of Besuk Kobokan, Besuk Bang, Besuk Kembar, Besuk Sat, and the tributaries connected to these flows.
Nurcahyo emphasized that disaster mitigation efforts depend not only on monitoring volcanic activity, but also on public discipline in complying with all established recommendations.
