Warning! Mount Semeru Erupts Again Tonight (Sunday, January 25, 2026)

Mount Semeru in East Java erupted again on Sunday (1/25/2026) at 18:24 WIB. In the last week, Mount Semeru has erupted 36 times.

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

Eruption visuals were not observed. Mount Semeru's eruption was still ongoing when this report was made.

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

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 25, 2026, at 12:00-18:00 WIB showed 24 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and earthquake durations of 67-129 seconds.

Furthermore, 3 exhalation earthquakes with amplitudes of 2-6 millimeters and earthquake durations of 37-51 seconds, and 1 distant tectonic earthquake with an amplitude of 35 millimeters s-p 36 seconds and an earthquake duration of 131 seconds occurred.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for hot cloud expansion and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 335 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 182 occurrences.

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