Warning! Mount Semeru Erupts Again This Morning (Sunday, August 3, 2025)

Mount Semeru in East Java erupted again on Sunday (8/3/2025) at 05:17 AM WIB. In the last week, Mount Semeru has erupted 35 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column was observed to be around 900 meters above the peak (4,576 meters above sea level).

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

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

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismic observations on August 3, 2025, from 00:00 to 23:59 WIB showed 39 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 61-241 seconds.

Furthermore, 2 rockfall earthquakes with amplitudes of 6-7 mm and durations of 78-79 seconds, and 9 emission earthquakes with amplitudes of 3-8 millimeters and durations of 42-67 seconds occurred.

PVMBG urges against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to conduct activities within 500 meters from the riverbanks (river borders) 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 5,437 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 2,180 occurrences.

(Read: Indication of Forest and Land Fire Area in East Kalimantan until June 2025)