Warning! Mount Semeru Erupts Again This Afternoon (Friday, August 29, 2025)

Mount Semeru in East Java erupted again on Friday (8/29/2025) at 17:34 WIB. In the last week, Mount Semeru has erupted 47 times.

According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column reached None meters above the peak (None meters above sea level).

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

(Read: Indonesia Has the Most Active Volcanoes in the World)

According to MAGMA Indonesia''s volcano 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 with amplitudes of 12-22 millimeters and a tremor duration of 64-182 seconds.

Furthermore, there were 4 avalanche tremors with amplitudes of 2-10 mm and tremor durations of 6-110 seconds, and 13 exhalation tremors with amplitudes of 4-8 millimeters and tremor 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 boundaries) 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 5,883 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,356 occurrences.

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