Warning! Mount Semeru Erupts Again Tonight (Monday, September 15, 2025)

Mount Semeru in East Java erupted again on Monday (15/9/2025) at 8:28 PM WIB. In the last week, Mount Semeru has erupted 5 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column observed reached None meters above the peak or 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 125 seconds.

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According to MAGMA Indonesia''s volcanic activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 15, 2025, from 00:00-23:59 WIB showed 53 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 54-221 seconds.

Furthermore, 2 rockfall earthquakes occurred with amplitudes of 4-6 mm and durations of 55-66 seconds, and 2 exhalation earthquakes with amplitudes of 6 millimeters and durations of 32-65 seconds.

PVMBG urges people not to carry out any activities 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 boundaries) 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 6,114 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,452 eruptions.

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