Warning! Mount Semeru Erupts Again This Afternoon (Saturday, April 11, 2026)

Mount Semeru in East Java erupted again on Saturday (April 11, 2026) at 4:25 PM WIB. In the last week, Mount Semeru has erupted 55 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 was about None meters above the peak or 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 144 seconds.

(Read: Jakarta Flood Points Distribution (January 13, 2026 at 08.00 WIB))

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level III (Alert). Earthquake observations on April 11, 2026 from 06.00-12.00 WIB showed 17 eruption/explosion earthquakes with amplitudes of 11-23 millimeters and earthquake durations of 61-156 seconds.

Then, 5 emission earthquakes with amplitudes of 3-7 millimeters and earthquake durations of 40-59 seconds, as well as 1 distant tectonic earthquake with an amplitude of 19 millimeters, s-p 18 seconds, and an earthquake duration of 43 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, within 13 kilometers of the peak (eruption center). Beyond that distance, the public should not carry out activities within 500 meters of the riverbank along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 1,416 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 763 events.

(Read: There Are 175 Disaster Events in Indonesia as of Early 2026, Floods Are the Most Common)