Mount Semeru Erupts Again Tonight (Tuesday, January 13, 2026)

Mount Semeru in East Java erupted again on Tuesday (1/13/2026) at 09:12 PM Western Indonesian Time. In the last week, Mount Semeru has erupted 18 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.

No visual eruption was observed. The eruption of Mount Semeru was still ongoing when this report was made.

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

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 13, 2026, from 12:00 PM to 06:00 PM Western Indonesian Time showed 34 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 62-141 seconds.

Furthermore, 4 times of emission earthquakes with amplitudes of 3-6 millimeters and durations of 36-57 seconds, and 3 times of distant tectonic earthquakes with amplitudes of 8-40 millimeters s-p 13-19 seconds and durations of 33-52 seconds occurred.

PVMBG urges against any activity in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond this distance, the public is advised not to conduct activities within 500 meters from the riverbanks along Besuk Kobokan, as it is potentially affected by the expansion of hot clouds and lahar flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 190 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 107 times.

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