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

Mount Semeru in East Java erupted again on Tuesday (August 19, 2025) at 09:52 AM WIB. In the last week, Mount Semeru has erupted 3 times.

Citing 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).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 110 seconds.

(Read: Volcanic Eruption Trends in Recent Years)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on August 19, 2025, from 00:00-23:59 WIB showed 48 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 62-200 seconds.

Then, 10 times of emission 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.

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 of the riverbank (river boundary) 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 5,685 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,278 times.

(Read: Indonesia Has the Most Active Volcanoes in the World)