Warning! Mount Semeru Erupts Again Early This Morning (Wednesday, August 20, 2025)

Mount Semeru in East Java erupted again on Wednesday (8/20/2025) at 01:20 AM WIB. In the last week, Mount Semeru has erupted 10 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 (None meters above sea level).

The eruption visuals were not observed. The Mount Semeru eruption was still ongoing when this report was made.

(Read: Volcanic Eruption Trends in Recent Years)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on August 20, 2025, from 00:00-23:59 WIB showed 52 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and earthquake durations of 41-238 seconds.

Furthermore, there were 14 exhalation earthquakes with amplitudes of 3-9 millimeters and durations of 24-64 seconds, and 1 harmonic earthquake with an amplitude of 3 millimeters and a duration of 267 seconds.

PVMBG urges not to carry out any activities in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not conduct activities within 500 meters from the riverbank (river border) 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 5,702 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,285 occurrences.

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