Mount Semeru Erupts Again This Morning (Sunday, December 14, 2025)

Mount Semeru in East Java erupted again on Sunday (14/12/2025) at 10:33 AM WIB. In the last week, Mount Semeru has erupted 41 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 reach None meters above the peak (None meters above sea level).

No visual eruption was observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 115 seconds.

(Read: Trends in Volcanic Eruptions in Recent Years)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on December 14, 2025, from 00:00-06:00 WIB, showed 43 eruption/explosion earthquakes with amplitudes of 10-23 millimeters and durations of 58-172 seconds.

Additionally, there were 4 rockfall earthquakes with amplitudes of 2-8 mm and durations of 32-109 seconds, and 8 emission earthquakes with amplitudes of 3-8 millimeters and durations of 42-68 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the summit (eruption center). Beyond this distance, people should not conduct activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan due to the potential for expansion of hot clouds (pyroclastic flows) and lahar flows up to 17 kilometers from the summit.

Throughout 2025, MAGMA Indonesia has recorded 7,336 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 3,019 occurrences.

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