Warning! Mount Semeru Erupts Again Tonight (Sunday, December 14, 2025)

Mount Semeru in East Java erupted again on Sunday (14/12/2025) at 18:10 WIB. In the last week, Mount Semeru has erupted 42 times.

Based on 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.

Eruption visuals were not observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Update on the Number of Facilities Damaged by Floods and Landslides in Sumatra (December 11, 2025))

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on December 14, 2025, from 12:00-18:00 WIB showed 42 eruption tremors with amplitudes of 10-22 millimeters and a tremor duration of 53-149 seconds.

Subsequently, there were 4 exhalation tremors with amplitudes of 4-8 millimeters and a duration of 47-79 seconds, and 1 distant tectonic earthquake with an amplitude of 15 millimeters s-p 11 seconds and a duration of 42 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, people should not engage in activities within 500 meters of the riverbank (river border) along Besuk Kobokan, as there is a potential for hot cloud expansion and lava flows up to 17 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 7,340 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 3,020 recorded.

(Read: Distribution of Fatalities Due to Floods and Landslides in North Sumatra (December 9, 2025))