Warning! This Morning Mount Semeru Erupts Again (Wednesday, December 24, 2025)

Mount Semeru in East Java erupted again on Wednesday (December 24, 2025) at 07.37 AM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 28 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column observed was approximately 500 meters above the peak or 4,176 meters above sea level.

The ash column was observed to be grey with thick intensity towards the north. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 88 seconds.

(Read: Earthquake with 4.7 M Magnitude Shakes Bonin Islands Region)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on December 24, 2025, from 00.00-06.00 AM WIB, showed 48 eruption quakes with amplitudes of 10-22 millimeters and durations of 70-162 seconds.

Furthermore, there were 6 rockfall quakes with amplitudes of 1-3 mm and durations of 38-71 seconds, and 4 emission quakes with amplitudes of 2-6 millimeters and durations of 42-64 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond this distance, the public is advised not to conduct activities within 500 meters from the river bank (river border) along Besuk Kobokan as it has the potential to be affected by the expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 7,500 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 3,126 times.

(Read: Earthquake with 4.4 M Magnitude Shakes Babar, Indonesia)