Mount Semeru Erupts Again This Morning (Monday, October 13, 2025)

Mount Semeru in East Java erupted again on Monday (October 13, 2025) at 07:41 AM WIB. In the last week, Mount Semeru has erupted 2 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the ash column height was observed to be around 200 meters above the peak (3,876 meters above sea level).

The ash column was observed to be white to gray with thick intensity towards the southwest. Mount Semeru's eruption was still ongoing when this report was made.

(Read: West Kalimantan Produced the Most CO2 Emissions from Forest Fires Until July 2023)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on October 13, 2025, from 00:00-23:59 WIB showed 84 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 43-143 seconds.

Subsequently, there were 7 exhalation earthquakes with amplitudes of 5-8 millimeters and durations of 35-56 seconds, and 2 harmonic tremors with amplitudes of 7-10 millimeters and durations of 43-57 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 conduct activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,636 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,615 events.

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