Mount Semeru Erupts Again Today, Ash Column Reaches 900 Meters

Mount Semeru in East Java erupted again on Sunday (January 11, 2026) at 01:01 AM WIB. In the last week, Mount Semeru has erupted 49 times.

Reporting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column was approximately 900 meters above the peak (4,576 meters above sea level).

The ash column was observed to be white to grey with thick intensity towards the northeast. The eruption was recorded on a seismograph with a maximum amplitude of 23 millimeters and a duration of 140 seconds.

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According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 11, 2026, from 18:00-23:59 WIB, showed 42 eruption tremors/earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 51-177 seconds.

Subsequently, there was 1 rockfall earthquake with an amplitude of 4 mm and a duration of 51 seconds, and 2 exhalation earthquakes with amplitudes of 5-7 millimeters and durations of 70-90 seconds.

PVMBG urges against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond this distance, people are advised not to carry out activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan due to the potential for hot cloud expansion and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 154 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 86 occurrences.

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