Warning! Mount Semeru Erupts Again This Morning (Monday, January 12, 2026)

Mount Semeru in East Java erupted again on Monday (12/1/2026) at 10:20 AM WIB. In the last week, Mount Semeru has erupted 4 times.

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

No visual eruption was 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 volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 12, 2026, from 00:00-06:00 WIB showed 38 eruption/explosion earthquakes with amplitudes of 15-22 millimeters and durations of 86-225 seconds.

Furthermore, 3 rockfall earthquakes with amplitudes of 4-6 mm and durations of 40-58 seconds, and 1 exhalation earthquake with an amplitude of 6 millimeters and a duration of 63 seconds occurred.

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

Throughout 2026, MAGMA Indonesia has recorded 171 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 93 occurrences.

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