Mount Semeru Erupts Again Tonight (Wednesday, January 28, 2026)

Mount Semeru in East Java erupted again on Wednesday (Jan 28, 2026) at 21:12 WIB. In the last week, Mount Semeru has erupted 15 times.

Based on 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 approximately None meters above the peak (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 122 seconds.

(Read: There are Still 381 High-Risk Forest Fire Hotspots in Indonesia in Early 2023)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 28, 2026, from 12:00-18:00 WIB, showed 24 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 46-178 seconds.

Then, there was 1 exhalation earthquake with an amplitude of 6 millimeters and a duration of 70 seconds, and 1 deep tectonic earthquake with an amplitude of 30 millimeters s-p 19 seconds and a duration of 60 seconds.

PVMBG urges 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 of the riverbank (river border) along Besuk Kobokan, as there is a potential for expansion of hot clouds and lahars up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 378 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 197 events.

(Read: Indications of Forest Fire Area in East Kalimantan until June 2025)