Mount Semeru Erupts Again This Afternoon (Wednesday, October 1, 2025)

Mount Semeru in East Java erupted again on Wednesday (1/10/2025) at 16:33 WIB. In the last week, Mount Semeru has erupted 19 times.

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

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 134 seconds.

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According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on October 1, 2025, from 00:00-23:59 WIB, showed 63 eruption/volcanic earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 71-180 seconds.

Subsequently, 18 exhalation earthquakes with amplitudes of 2-8 millimeters and durations of 31-89 seconds, and 1 felt earthquake, scale iii MMI with an amplitude of 30 millimeters, s-p unobserved, and a duration of 579 seconds.

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, the public should not engage in activities within 500 meters of the riverbanks (river borders) along Besuk Kobokan, as there is a potential for hot ash clouds and lava flows to extend up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,485 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,541 incidents.

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