Mount Semeru Erupts Again Tonight (Friday, August 29, 2025)

Mount Semeru in East Java erupted again on Friday (August 29, 2025) at 00:53 WIB. In the past week, Mount Semeru has erupted 36 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.

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 154 seconds.

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

According to MAGMA Indonesia''s volcanic activity report, Mount Semeru''s activity level is at Level II (Alert). Seismic observations on August 29, 2025, from 00:00-23:59 WIB showed 42 eruption tremors/earthquakes with amplitudes of 12-22 millimeters and durations of 64-182 seconds.

Subsequently, there were 4 rockfall tremors with amplitudes of 2-10 mm and durations of 6-110 seconds, and 13 emission tremors with amplitudes of 4-8 millimeters and durations of 43-118 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,860 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,345 occurrences.

(Read: Volcanic Eruption Trends in Recent Years)