Warning! Mount Semeru Erupts Again Tonight (Sunday, August 17, 2025)

Mount Semeru in East Java erupted again on Sunday (August 17, 2025) at 6:57 PM WIB. In the last week, Mount Semeru has erupted 56 times.

According to 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 None meters above the peak (None meters above sea level).

Visual eruption was not observed. The eruption of Mount Semeru was still ongoing when this report was made.

(Read: There were 749 Natural Disaster Incidents in Indonesia until the End of March 2023, Most of Them Floods)

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismic observations on August 17, 2025, from 00:00-23:59 WIB showed 52 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 52-157 seconds.

Additionally, 10 puff earthquakes with amplitudes of 4-8 millimeters and durations of 35-72 seconds, and 1 harmonic earthquake with an amplitude of 6 millimeters and a duration of 65 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 this distance, the public should not engage in activities within 500 meters of the riverbank (river border) 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 5,658 volcano eruptions throughout Indonesia. Mount Semeru in East Java has erupted the most, with 2,273 eruptions.

(Read: Nearly 5 Thousand Natural Disaster Incidents in Indonesia Throughout 2023, Forest and Land Fires Dominated)