Mount Semeru Erupts Early Saturday Morning, Status Remains on Alert

Mount Semeru in East Java erupted again on Saturday, April 12, 2025, at 03:57 WIB (Western Indonesian Time). In the last week, Mount Semeru has erupted 70 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 700 meters above the peak or 4,376 meters above sea level.

The ash column was observed to be white to gray with thick intensity towards the southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 190 seconds.

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level II (Alert). Observations of seismic activity on April 12, 2025, from 00:00 to 23:59 WIB, showed 49 eruption quakes with amplitudes of 10-22 millimeters and durations of 60-205 seconds.

Furthermore, there was 1 rockfall earthquake with an amplitude of 4 mm and a duration of 52 seconds, and 8 ash emission quakes with amplitudes of 2-8 millimeters and durations of 37-65 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, the public should not engage in activities within 500 meters of the riverbank (river buffer zone) along Besuk Kobokan due to the potential for the expansion of pyroclastic flows and lahars up to 13 kilometers from the peak.

During 2025, MAGMA Indonesia has recorded 2,772 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java has experienced the most eruptions, with 1,278 recorded events.