Mount Semeru Erupts Again This Morning (Tuesday, April 22, 2025)

Mount Semeru in East Java erupted again on Tuesday, April 22, 2025, at 05:55 WIB (Western Indonesian Time). In the last week, Mount Semeru has erupted 23 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the ash column height was observed to be approximately 800 meters above the peak, or 4,476 meters above sea level.

The ash column was observed to be white to gray with moderate intensity towards the north. The eruption of Mount Semeru was still ongoing at the time of this report.

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Observations of seismic activity on April 22, 2025, from 00:00 to 23:59 WIB, showed 43 eruption quakes with amplitudes of 10-23 millimeters and durations of 53-160 seconds.

Furthermore, there were 5 tremor quakes with amplitudes of 4-8 millimeters and durations of 45-78 seconds, and 1 local tectonic earthquake with an amplitude of 10 millimeters, S-P 6.9 seconds, and a duration of 32 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 carry out activities within 500 meters of the riverbank (river boundary) 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 3,121 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java had the most eruptions, with 1,372.