Mount Semeru Erupts Again This Morning (Saturday, January 31, 2026)

Mount Semeru in East Java erupted again on Saturday (Jan 31, 2026) at 05:22 AM Western Indonesian Time. In the last week, Mount Semeru has erupted 31 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached a height of 800 meters above the peak or 4,476 meters above sea level.

The observed ash column was white to gray with moderate intensity, heading north. Mount Semeru's eruption was still ongoing when this report was made.

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According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 31, 2026, from 18:00-23:59 Western Indonesian Time, showed 21 eruption/explosive earthquakes with amplitudes of 11-23 millimeters and durations of 69-129 seconds.

Subsequently, there was 1 rockfall earthquake with an amplitude of 9 mm and a duration of 119 seconds, as well as 7 emission earthquakes with amplitudes of 2-7 millimeters and durations of 44-67 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, the public should not conduct activities within 500 meters from the riverbanks along Besuk Kobokan, as there is a potential to be affected by expanding hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 407 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 213.

(Read: These are the 10 Largest Earthquakes in History, Two of Them from Indonesia)