Warning! This Morning Mount Semeru Erupts Again (Saturday, December 27, 2025)

Mount Semeru in East Java erupted again on Saturday (12/27/2025) at 09.35 AM Western Indonesia Time. In the last week, Mount Semeru has erupted 36 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 (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 116 seconds.

(Read: Floods Dominate Natural Disasters in Indonesia by End of February 2024)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismicity observations on December 27, 2025, from 00.00-06.00 AM Western Indonesia Time showed 43 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 72-165 seconds.

Additionally, there were 11 avalanche earthquakes with amplitudes of 2-8 mm and durations of 39-68 seconds, and 1 exhalation earthquake with an amplitude of 2 millimeters and a duration of 66 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, the public should not engage in activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan, as there is a potential for hot cloud expansion and lahars up to 17 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 7,526 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 3,134 events.

(Read: There Were 137 Natural Disaster Events Towards End of January 2024, Floods Most Numerous)