Warning! This Morning Mount Semeru Erupts Again (Thursday, January 1, 2026)

Mount Semeru in East Java erupted again on Thursday (1/1/2026) at 05:29 AM Western Indonesian Time. In the last week, Mount Semeru has erupted 3 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 900 meters above the peak or 4,576 meters above sea level.

The observed ash column was white to gray with thick intensity towards the northeast and east. The eruption was recorded on a seismograph with a maximum amplitude of 23 millimeters and a duration of 136 seconds.

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According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 1, 2026, from 00:00-06:00 AM Western Indonesian Time, showed 35 eruption/explosion earthquakes with amplitudes of 10-23 millimeters and durations of 57-126 seconds.

Subsequently, there were 2 rockfall earthquakes with an amplitude of 2 mm and durations of 39-40 seconds, and 6 emission earthquakes with amplitudes of 5-8 millimeters and durations of 42-70 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 along Besuk Kobokan as there is a potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 4 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 3 times.

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