Mount Semeru Erupts on Tuesday Afternoon, Status Alert

Mount Semeru in East Java erupted again on Tuesday (January 6, 2026) at 11:00 AM WIB. In the last week, Mount Semeru has erupted 5 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 peak (None meters above sea level).

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

(Read: NTT Always Hit by Forest and Land Fires in the Last 10 Years, BMKG Urges Increased Preparedness)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on January 6, 2026, at 00:00-06:00 WIB showed 37 eruption tremors with amplitudes of 10-22 millimeters and a tremor duration of 56-143 seconds.

Subsequently, there were 2 avalanche tremors with an amplitude of 3 mm and a duration of 46-69 seconds, and 8 emission tremors with amplitudes of 3-8 millimeters and a duration of 38-82 seconds.

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

Throughout 2026, MAGMA Indonesia has recorded 78 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 42.

(Read: Due to Forest and Land Fires, Acute Respiratory Infections in South Kalimantan Reached 189 Thousand Cases as of September 2023)