Warning! Mount Semeru Erupts Again This Afternoon (Tuesday, December 30, 2025)

Mount Semeru in East Java erupted again on Tuesday (12/30/2025) at 17:53 WIB. In the last week, Mount Semeru has erupted 73 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 None meters above the peak or None meters above sea level.

Visual eruptions were not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 141 seconds.

(Read: Volcanic Eruption Trends in Recent Years)

According to the MAGMA Indonesia volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on December 30, 2025, from 06:00-12:00 WIB showed 24 eruption/explosion earthquakes with amplitudes of 14-22 millimeters and durations of 79-151 seconds.

Furthermore, there were 3 rockfall earthquakes with amplitudes of 2-3 mm and durations of 39-57 seconds, and 6 emission earthquakes with amplitudes of 3-8 millimeters and durations of 43-62 seconds.

PVMBG advises against any activity in the southeastern sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to conduct activities within 500 meters from the riverbank (river border) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

During 2025, MAGMA Indonesia recorded 7,557 volcanic eruptions throughout Indonesia. Mount Semeru in East Java had the most eruptions with 3,146 occurrences.

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)