Mount Semeru Erupted on Tuesday Night, Status Alert

Mount Semeru in East Java erupted again on Tuesday (November 25, 2025) at 8:05 PM WIB. In the last week, Mount Semeru has erupted 16 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).

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

(Read: Indonesia Becomes the Country Most Frequently Struck by Earthquakes per 2025)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level IV (Alert). Seismicity observations on November 25, 2025, from 12:00-18:00 WIB showed 40 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 49-142 seconds.

Furthermore, there were 2 avalanche earthquakes with amplitudes of 3-8 mm and durations of 37-53 seconds, and 13 exhalation earthquakes with amplitudes of 2-9 millimeters and durations of 22-104 seconds.

PVMBG urges against any activities in the southeast sector along Besuk Kobokan, as far as 20 kilometers from the peak (eruption center). Beyond that distance, people should not conduct activities within 500 meters from the riverbanks along Besuk Kobokan due to the potential for being affected by expanding hot clouds and lava flows.

Throughout 2025, MAGMA Indonesia has recorded 7,044 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,828 events.

(Read: 4.2 M Earthquake Shakes Fox Aleutian Islands)