Warning! Mount Semeru Erupts Again Tonight (Tuesday, August 19, 2025)

Mount Semeru in East Java erupted again on Tuesday (19/8/2025) at 10:26 PM WIB. In the last week, Mount Semeru has erupted 8 times.

Quoting 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 was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 101 seconds.

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

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismicity observations on August 19, 2025, at 00.00-23.59 WIB showed 48 eruption/emission earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 62-200 seconds.

Furthermore, 10 exhalation earthquakes with amplitudes of 3-7 millimeters and durations of 29-62 seconds, and 1 harmonic earthquake with an amplitude of 3 millimeters and a duration of 129 seconds occurred.

PVMBG advises against any activities 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 (river borders) along Besuk Kobokan due to the potential for being affected by expanding hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,699 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,283 times.

(Read: There Are Still 381 High-Risk Forest and Land Fire Hotspots in Indonesia in Early 2023)