Mount Semeru Erupts Again Tonight (Wednesday, December 3, 2025)

Mount Semeru in East Java erupted again on Wednesday (12/3/2025) at 11:20 PM WIB. In the last week, Mount Semeru has erupted 46 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column was observed to be approximately None meters above the peak or None meters above sea level.

No visual eruption was observed. The eruption was recorded on a seismograph with a maximum amplitude of 19 millimeters and a duration of 119 seconds.

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According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on December 3, 2025, from 12:00-18:00 WIB, showed 25 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 53-164 seconds.

Furthermore, there were 6 rockfall earthquakes with amplitudes of 2-4 mm and durations of 44-81 seconds, and 11 gas emission earthquakes with amplitudes of 2-8 millimeters and durations of 48-96 seconds.

PVMBG advises against any activities in the southeastern sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks along Besuk Kobokan, as there is a potential for hot clouds and lahars to extend up to 17 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 7,178 volcano eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,925 times.

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