Alert! Mount Semeru Erupts Again This Afternoon (Monday, February 23, 2026)

Mount Semeru in East Java erupted again on Monday (February 23, 2026) at 11:35 WIB. In the past week, Mount Semeru has erupted only once.

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 or None meters above sea level.

Eruption visuals were not observed. The eruption was recorded on the seismograph with a maximum amplitude of 22 millimeters and a duration of 111 seconds.

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

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level III (Alert). Earthquake observations on February 23, 2026, from 00:00 to 06:00 WIB showed 18 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 96-206 seconds.

Then, 1 emission earthquake with an amplitude of 7 millimeters and a duration of 89 seconds, as well as 1 local tectonic earthquake with an amplitude of 27 millimeters, s-p 4.5 seconds, and a duration of 29 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, within 13 kilometers of the peak (eruption center). Beyond that 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 the expansion of hot clouds and lahar flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 734 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 385 events.

(Read: West Kalimantan Has the Worst Air Quality in Indonesia This Morning (Friday, August 18, 2023))