Mount Marapi Erupted on Saturday Afternoon, Activity Level at Alert

Mount Marapi in West Sumatra erupted again on Saturday (20/9/2025) at 4:24 PM WIB. In the last week, Mount Marapi has erupted 3 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 1,000 meters above the peak or 3,891 meters above sea level.

The observed ash column was grey with thick intensity towards the south. Mount Marapi''s eruption was still ongoing when this report was made.

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According to MAGMA Indonesia''s volcano activity report, Mount Marapi''s activity level is at Level II (Alert). Seismic observations on September 20, 2025, from 00:00-23:59 WIB showed 21 non-harmonic tremors with amplitudes of 0.7-2 millimeters and earthquake durations of 85-552 seconds.

Additionally, there was 1 low-frequency earthquake with an amplitude of 2 millimeters and a duration of 18 seconds, and 1 deep volcanic earthquake with an amplitude of 1 millimeter s-p 1.8 seconds and a duration of 13 seconds.

PVMBG urges the public around Mount Marapi and climbers/visitors/tourists not to enter or conduct activities within a 3-kilometer radius from the center of activity (Verbeek Crater) of Mount Marapi.

Throughout 2025, MAGMA Indonesia has recorded 6,180 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions (2,463 times), while Mount Marapi erupted 99 times.

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