Alert! Mount Semeru Erupts Again Tonight (Saturday, April 11, 2026)

Mount Semeru in East Java erupted again on Saturday (April 11, 2026) at 19:18 WIB. In the past week, Mount Semeru has erupted 57 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 is approximately 900 meters above the peak or 4,576 meters above sea level.

The ash column appears white to gray with thick intensity towards the northwest. The eruption was recorded on the seismograph with a maximum amplitude of 22 millimeters and a duration of 138 seconds.

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According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is Level III (Alert). Earthquake observations on April 11, 2026 from 12:00-18:00 WIB showed 19 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 51-170 seconds.

Then, 7 emission earthquakes with amplitudes of 2-8 millimeters and durations of 49-87 seconds, as well as 5 harmonic earthquakes with amplitudes of 1-4 millimeters and durations of 63-452 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, up to 13 kilometers from the peak (eruption center). Beyond that distance, residents should not conduct activities within 500 meters of the riverbank along the Besuk Kobokan due to the potential for being affected by expanding hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 1,419 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 765 events.

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