Warning! Mount Semeru Erupts Again Tonight (Thursday, November 20, 2025)

Mount Semeru in East Java erupted again on Thursday (20/11/2025) at 7:20 PM WIB. In the last week, Mount Semeru has erupted 13 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 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 22 millimeters and a duration of 300 seconds.

(Read: Number of Natural Disaster Fatalities in Indonesia Surged in 2024)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level IV (Alert). Seismicity observations on November 20, 2025, from 12:00 PM to 6:00 PM WIB, showed 34 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and durations of 93-139 seconds.

Additionally, 15 rockfall earthquakes occurred with amplitudes of 2-18 mm and durations of 29-133 seconds, along with 6 exhalation earthquakes with amplitudes of 3-8 millimeters and durations of 43-73 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 20 kilometers from the peak (eruption center). Beyond this distance, the public should not engage in activities within 500 meters of the riverbanks along Besuk Kobokan due to the potential for hot cloud expansion and lava flows.

Throughout 2025, MAGMA Indonesia has recorded 7,000 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,807 times.

(Read: There Were 2 Thousand Natural Disasters in Indonesia in 2024, Floods Dominating)