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

Mount Semeru in East Java erupted again on Tuesday (January 13, 2026) at 18:26 WIB. In the last week, Mount Semeru has erupted 16 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 observed reached None meters above the peak (None meters above sea level).

The visual eruption was not observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Hotspots for Forest and Land Fires in South Sumatra Increased in Mid-October 2023)

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 12:00-18:00 WIB showed 34 eruption tremors with amplitudes of 10-22 millimeters and durations of 62-141 seconds.

Subsequently, there were 4 exhalation tremors with amplitudes of 3-6 millimeters and durations of 36-57 seconds, and 3 distant tectonic tremors with amplitudes of 8-40 millimeters S-P 13-19 seconds and durations of 33-52 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, 13 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 186 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 105 occurrences.

(Read: Many Forest and Land Fires in Concession Areas, Especially Palm Oil Concessions)