Mount Semeru Erupts Again in the Early Hours of Today (Wednesday, April 9, 2025)

Mount Semeru in East Java erupted again on Wednesday, April 9, 2025, at 02:24 WIB (Western Indonesian Time). In the last 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 reach 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 82 seconds.

According to the MAGMA Indonesia volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Observations of seismic activity on April 9, 2025, from 00:00 to 23:59 WIB, showed 43 eruption quakes with amplitudes of 10-22 millimeters and durations of 58-220 seconds.

Furthermore, there were 5 tremor quakes with amplitudes of 4-8 millimeters and durations of 48-172 seconds, and 4 distant tectonic quakes with amplitudes of 6-20 millimeters, S-P 14-32 seconds, and durations of 39-84 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, up to 8 kilometers from the peak (eruption center). Outside this distance, people should not engage in activities within 500 meters of the riverbank (river edge) along Besuk Kobokan due to the potential for pyroclastic flow and lava flows extending up to 13 kilometers from the peak.

During 2025, MAGMA Indonesia has recorded 2,687 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java had the most eruptions, with 1,244.