Mount Semeru Erupts on Saturday Night, Its Status is Alert

Mount Semeru in East Java erupted again on Saturday (29/11/2025) at 00.43 WIB. In the last week, Mount Semeru has erupted 51 times.

According to 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 around None meters above the peak (None meters above sea level).

No visual eruption was observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level IV (Alert). Seismicity observations on November 29, 2025, from 18.00-23.59 WIB showed 37 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 71-159 seconds.

Additionally, there were 2 rockfall earthquakes with amplitudes of 2-4 mm and durations of 45-79 seconds, and 6 emission earthquakes with amplitudes of 5-7 millimeters and durations of 45-82 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, within 20 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for being affected by expanding hot clouds and lava flows.

Throughout 2025, MAGMA Indonesia has recorded 7,097 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,863 events.

(Read: Indonesia Has the Most Active Volcanoes in the World)