Mount Semeru Erupts Again This Morning (Sunday, August 17, 2025)

Mount Semeru in East Java erupted again on Sunday (August 17, 2025) at 05:20 AM WIB. In the last week, Mount Semeru has erupted 49 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.

The eruption visuals were not observed. Mount Semeru's eruption is still ongoing as this report is being made.

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

Additionally, 10 times of emission earthquakes with amplitudes of 4-8 millimeters and durations of 35-72 seconds, and 1 harmonic tremor with an amplitude of 6 millimeters and a duration of 65 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 that distance, people should not engage in activities within 500 meters of the riverbank (river border) along Besuk Kobokan as it has the potential to be affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,645 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,266 times.

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