Warning! Mount Semeru Erupts Again This Afternoon (Tuesday, September 9, 2025)

Mount Semeru in East Java erupted again on Tuesday (9/9/2025) at 4:41 PM WIB. In the last week, Mount Semeru has erupted 15 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 around None meters above the peak (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 139 seconds.

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According to the MAGMA Indonesia volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismic observations on September 9, 2025, from 00:00-23:59 WIB showed 54 eruption/explosion earthquakes with amplitudes of 12-22 millimeters and durations of 56-189 seconds.

Furthermore, there were 5 avalanche earthquakes with amplitudes of 3-5 mm and durations of 41-68 seconds, and 14 exhalation earthquakes with amplitudes of 3-9 millimeters and durations of 36-65 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 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, as there is a potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,028 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 2,417 eruptions.

(Read: 749 Natural Disaster Events in Indonesia Until End of March 2023, Floods Most Frequent)