Mount Semeru Erupts Again This Afternoon (Sunday, October 19, 2025)

Mount Semeru in East Java erupted again on Sunday (10/19/2025) at 4:58 PM WIB. In the last week, Mount Semeru has erupted 25 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 or None meters above sea level.

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 105 seconds.

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According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on October 19, 2025, from 00:00-23:59 WIB showed 54 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 62-158 seconds.

Furthermore, there were 12 avalanche earthquakes with amplitudes of 2-4 mm and durations of 37-137 seconds, and 21 emission earthquakes with amplitudes of 3-8 millimeters and durations of 49-86 seconds.

PVMBG urges 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 along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,708 volcano eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,638 eruptions.

(Read: 25% of Indonesia's Peat Hydrological Units Highly Prone to Flooding, These Are the Areas)