Mount Semeru Erupts Again This Afternoon (Sunday, April 12, 2026)

Mount Semeru in East Java erupted again on Sunday (April 12, 2026) at 1:04 PM WIB. In the past week, Mount Semeru has erupted 64 times.

Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column observed is about None meters above the peak (None meters above sea level).

No eruption visuals were observed. The eruption was recorded on the seismograph with a maximum amplitude of 22 millimeters and a duration of 141 seconds.

(Read: Only 12 Regions Meet WHO 2024 Air Quality Standards)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Earthquake observations on April 12, 2026 from 6:00 AM to 12:00 PM WIB showed 19 eruption/explosion earthquakes with amplitudes of 11-23 millimeters and durations of 64-134 seconds.

Then, 1 collapse earthquake with an amplitude of 2 mm and duration of 41 seconds, as well as 4 emission earthquakes with amplitudes of 3-8 millimeters and durations of 40-52 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, within 13 kilometers of the peak (eruption center). Outside this distance, residents should avoid activities within 500 meters of the riverbanks along Besuk Kobokan due to the potential for hot cloud expansion and lava flows up to 17 kilometers from the peak.

During 2026, MAGMA Indonesia has recorded 1,427 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 772 events.

(Read: Indonesia, the Country with the Worst Air Quality in Southeast Asia)