Mount Semeru Erupts Again This Evening (Wednesday, April 23, 2025)

Mount Semeru in East Java erupted again on Wednesday, April 23, 2025, at 5:06 PM WIB. In the last week, Mount Semeru has erupted 34 times.

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

The ash column was observed to be gray with thick intensity towards the west. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 123 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 23, 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 emission quakes with amplitudes of 4-8 millimeters and durations of 45-78 seconds, and 1 local tectonic quake 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 engage in activities within 500 meters of the riverbank (river buffer zone) 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 3,155 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java had the most eruptions, with 1,383.