Mount Semeru Erupts Again Early This Morning, Volcanic Ash Height Around 700 Meters

Mount Semeru in East Java erupted again on Tuesday (11/11/2025) at 04:35 AM WIB. In the last week, Mount Semeru has erupted 5 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 reached 700 meters above the peak or 4,376 meters above sea level.

The ash column was observed to be white to grey with thick intensity towards the north and northwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 143 seconds.

(Read: 5 Provinces with the Most Forest and Land Fire Hotspots in Peatland Ecosystems until August 2025)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on November 11, 2025, from 00:00-23:59 WIB showed 141 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 64-169 seconds.

Subsequently, there were 15 avalanche earthquakes with amplitudes of 2-6 mm and durations of 36-80 seconds, and 18 exhalation earthquakes with amplitudes of 2-8 millimeters and durations of 33-71 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters of the riverbanks (river borders) along Besuk Kobokan, as there is a potential for hot clouds and lava flows to extend up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,929 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,783 events.

(Read: Indication of Forest and Land Fire Area in Central Kalimantan Province in the Last Decade)