Warning! Mount Semeru Erupts Again This Morning (Monday, August 25, 2025)

Mount Semeru in East Java erupted again on Monday (8/25/2025) at 07:22 AM WIB. In the last week, Mount Semeru has erupted 2 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached 500 meters above the peak (4,176 meters above sea level).

The observed ash column was white to gray with thick intensity towards the northwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 135 seconds.

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

According to MAGMA Indonesia''s volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismic observations on August 25, 2025, from 00:00-23:59 WIB showed 44 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 54-183 seconds.

Furthermore, there were 5 rockfall earthquakes with amplitudes of 2-6 mm and durations of 49-90 seconds, and 14 exhalation earthquakes with amplitudes of 3-9 millimeters and durations of 35-90 seconds.

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

Throughout 2025, MAGMA Indonesia has recorded 5,783 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,311 events.

(Read: NTT Always Affected by Forest Fires in the Last 10 Years, BMKG Urges Increased Preparedness)