Warning! Mount Semeru Erupts Again Tonight (Monday, October 13, 2025)

Mount Semeru in East Java erupted again on Monday (10/13/2025) at 00:15 WIB. In the last week, Mount Semeru has only erupted once.

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 be around None meters above the peak or None meters above sea level.

No visual eruption was observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Floods and Extreme Weather, Most Frequent Natural Disasters in Indonesia until Early August 2023)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 13, 2025, from 00:00-23:59 WIB showed 84 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 43-143 seconds.

Subsequently, there were 7 emission earthquakes with amplitudes of 5-8 millimeters and durations of 35-56 seconds, as well as 2 harmonic tremors with amplitudes of 7-10 millimeters and durations of 43-57 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 from the riverbanks (river boundaries) along Besuk Kobokan, as there is a potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,633 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,614 occurrences.

(Read: There Were 137 Natural Disaster Incidents Towards the End of January 2024, Most of Which Were Floods)