Mount Semeru Erupts Again Early This Morning (Tuesday, November 25, 2025)

Mount Semeru in East Java erupted again on Tuesday (11/25/2025) at 04:45 AM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 14 times.

According to 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 800 meters above the peak (4,476 meters above sea level).

The ash column was observed to be white to gray with moderate intensity towards the north. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Indonesia Has the Most Active Volcanoes in the World)

According to the MAGMA Indonesia volcanic activity report, Mount Semeru's activity level is at Level IV (Awas/Alert). Seismicity observations on November 25, 2025, from 18:00-23:59 WIB showed 45 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 64-162 seconds.

Additionally, there were 2 avalanche earthquakes with amplitudes of 3-10 mm and durations of 29-107 seconds, as well as 4 emission earthquakes with amplitudes of 6-8 millimeters and durations of 43-45 seconds.

PVMBG urges people not to engage in any activities in the southeastern sector along Besuk Kobokan, as far as 20 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to conduct activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan, as there is a potential for expansion of hot clouds and lava flows.

Throughout 2025, MAGMA Indonesia has recorded 7,040 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,826 occurrences.

(Read: Trends in Volcanic Eruptions in Recent Years)