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

Mount Semeru in East Java erupted again on Sunday (8/17/2025) at 00:18 WIB. In the last week, Mount Semeru has erupted 48 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 observed reached None meters above the peak or None meters above sea level.

Visual eruption was not observed. Mount Semeru's eruption is still ongoing as of this report.

(Read: Flood Disaster Events in Indonesia Increased Period 2008-2025)

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

Then, 10 exhalation earthquakes with amplitudes of 4-8 millimeters and a duration of 35-72 seconds, and 1 harmonic earthquake with an amplitude of 6 millimeters and a duration of 65 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 riverbank (river border) 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 5,644 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,265 events.

(Read: Jakarta Road Sections Still Flooded (July 9, 2025, 09:00 AM WIB))