Warning! Mount Semeru Erupts Again Tonight (Saturday, August 16, 2025)

Mount Semeru in East Java erupted again on Saturday (August 16, 2025) at 00:19 WIB. In the last week, Mount Semeru has erupted 41 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column reached None meters above the peak or None meters above sea level.

Eruption visuals were not observed. The eruption of Mount Semeru was still ongoing when this report was made.

(Read: Due to Forest Fires, ARI Cases in South Kalimantan Reached 189 Thousand by September 2023)

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismic observations on August 16, 2025, from 00:00-23:59 WIB showed 40 eruption/emission earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 62-154 seconds.

Additionally, 11 emission earthquakes occurred with amplitudes of 4-8 millimeters and durations of 39-110 seconds, as well as 7 distant tectonic earthquakes with amplitudes of 5-24 millimeters s-p 11-63 seconds and durations of 40-150 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 from the riverbanks along Besuk Kobokan, as there is potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,630 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,258 occurrences.

(Read: Indication of Forest and Land Fire Area in West Kalimantan Province 2016-2025)