Mount Semeru Erupts Again Tonight (Saturday, January 3, 2026)

Mount Semeru in East Java erupted again on Saturday (3/1/2026) at 18:44 WIB. In the last week, Mount Semeru has erupted 26 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 around None meters above the peak or None meters above sea level.

Eruption visuals were not observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: There Were Almost 300 Natural Disasters Until Mid-February 2024)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 3, 2026, from 12:00-18:00 WIB showed 21 eruption tremors with amplitudes of 11-22 millimeters and tremor durations of 66-124 seconds.

Then, 1 rockfall tremor with an amplitude of 2 mm and a duration of 90 seconds, and 10 emission tremors with amplitudes of 3-8 millimeters and durations of 43-68 seconds occurred.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, people should not conduct activities within 500 meters from the riverbanks (river borders) 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 45 volcano eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 26 eruptions.

(Read: Hundreds of Natural Disasters Until Early April 2024, Floods Most Frequent)