Mount Semeru Erupts Again Tonight (Saturday, April 11, 2026)

Mount Semeru in East Java erupted again on Saturday (April 11, 2026) at 00:14 WIB. In the past week, Mount Semeru has erupted 49 times.

Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height is approximately 600 meters above the peak or 4,276 meters above sea level.

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

(Read: 5.3 M Earthquake Shakes 17 Km West of Pasuquin,)

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on April 11, 2026 from 18:00 to 23:59 WIB showed 21 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and durations of 98-106 seconds.

Then, 2 avalanche earthquakes with amplitudes of 4-6 mm and durations of 30-104 seconds, as well as 3 emission earthquakes with amplitudes of 2-5 millimeters and durations of 24-50 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, up to 13 kilometers from the peak (eruption center). Outside this distance, residents are advised not to carry out activities within 500 meters of the riverbanks along the Besuk Kobokan due to the potential for being affected by expanding pyroclastic flows and lahar flows up to 17 kilometers from the peak.

In 2026, MAGMA Indonesia has recorded 1,405 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 757 events.

(Read: 4.7 M Earthquake Shakes the Bonin Islands Region)