Mount Semeru Erupts Again This Morning (Sunday, October 5, 2025)

Mount Semeru in East Java erupted again on Sunday (5/10/2025) at 08:52 AM WIB. In the last week, Mount Semeru has erupted 35 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column reached 200 meters above the peak or 3,876 meters above sea level.

The ash column was observed to be white to grey with thick intensity towards the southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 118 seconds.

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According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 5, 2025, from 00:00-23:59 WIB showed 89 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 50-161 seconds.

Furthermore, 5 shallow-emission earthquakes occurred with amplitudes of 5-8 millimeters and durations of 36-60 seconds, and 1 deep volcanic earthquake with an amplitude of 25 millimeters s-p 3.3 seconds and a duration of 20 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, people should not engage in activities within 500 meters of the riverbanks (river borders) along Besuk Kobokan, as there is a potential for hot cloud expansion and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,537 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,557 events.

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