Warning! Mount Semeru Erupts Again Tonight (Thursday, February 12, 2026)

Mount Semeru in East Java erupted again on Thursday (February 12, 2026) at 00:10 WIB. In the past week, Mount Semeru has erupted 25 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 is approximately 900 meters above the peak (4,576 meters above sea level).

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

(Read: Number of Natural Disaster Victims in Indonesia as of July 8, 2025)

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level III (Alert). Earthquake observations on February 12, 2026 from 18:00-23:59 WIB showed 22 eruption/explosion earthquakes with an amplitude of 10-22 millimeters and a duration of 84-170 seconds.

Then, 8 emission earthquakes with an amplitude of 2-8 millimeters and a duration of 50-80 seconds, as well as 2 distant tectonic earthquakes with an amplitude of 4 millimeters, s-p time of 12-14 seconds and a duration of 33-43 seconds.

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

Throughout 2026, MAGMA Indonesia has recorded 567 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 292 events.

(Read: Nearly 300 Natural Disasters by Mid-February 2024)