Warning! Mount Semeru Erupts Again This Afternoon (Monday, July 28, 2025)

Mount Semeru in East Java erupted again on Monday (7/28/2025) at 12:37 PM WIB. In the last week, Mount Semeru has erupted twice.

According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column observed reached None meters above the peak (None meters above sea level).

The visual of the eruption was not observed. The eruption of Mount Semeru was still ongoing when this report was made.

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According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on July 28, 2025, from 00:00-23:59 WIB showed 38 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 56-192 seconds.

Furthermore, 3 rockfall earthquakes with amplitudes of 4-5 mm and durations of 45-132 seconds, and 7 exhalation earthquakes with amplitudes of 2-8 millimeters and durations of 34-128 seconds occurred.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbank (river border) along Besuk Kobokan due to the potential for being affected by expanding hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,347 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,147 occurrences.

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