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

Mount Semeru in East Java erupted again on Saturday (August 16, 2025) at 6:29 PM WIB. In the last week, Mount Semeru has erupted 46 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 None meters above the peak or None meters above sea level.

No visual eruption was observed. The eruption of Mount Semeru was still ongoing when this report was made.

(Read: 5.5 M Earthquake Shakes 262 Km East of Levuka,)

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 earthquakes with amplitudes of 10-22 millimeters and a duration of 62-154 seconds.

Additionally, 11 gas emission earthquakes with amplitudes of 4-8 millimeters and a duration of 39-110 seconds, and 7 distant tectonic earthquakes with amplitudes of 5-24 millimeters s-p 11-63 seconds and a duration of 40-150 seconds occurred.

PVMBG advises 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 from the riverbanks (river boundaries) 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 5,639 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,263 times.

(Read: 4.16 M Earthquake Shakes Mona Passage)