Warning! Mount Semeru Erupts Again Tonight (Friday, September 26, 2025)

Mount Semeru in East Java erupted again on Friday (September 26, 2025) at 7:26 PM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 35 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 was observed to be around 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: Volcanic Eruption Trends in Recent Years)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on September 26, 2025, from 00:00-23:59 WIB showed 85 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 51-192 seconds.

Furthermore, there were 12 exhalation earthquakes with amplitudes of 4-8 millimeters and durations of 43-80 seconds, and 5 harmonic tremors with amplitudes of 2-8 millimeters and durations of 43-80 seconds.

PVMBG urges against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Outside this distance, the public is advised not to engage in activities within 500 meters from the riverbanks 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 6,360 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,501 occurrences.

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