Mount Marapi Erupts on Thursday Afternoon, Activity Level at Alert

Mount Marapi in West Sumatra erupted again on Thursday (4/12/2025) at 4:16 PM WIB. In the last week, Mount Marapi has erupted 2 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 approximately None meters above the peak (None meters above sea level).

Visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 24.9 millimeters and a duration of 31.7 seconds.

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

According to MAGMA Indonesia's volcano activity report, Mount Marapi's activity level is at Level II (Alert). Seismic observations on December 4, 2025, from 00:00-23:59 WIB showed 9 non-harmonic tremors with amplitudes of 1.1-2.7 millimeters and earthquake durations of 112-1355 seconds.

Subsequently, there was 1 deep volcanic earthquake with an amplitude of 4.3 millimeters s-p 2.8 seconds and an earthquake duration of 16.93 seconds, as well as 1 continuous tremor earthquake with an amplitude of 0.5-1.5 millimeters, dominant at 1 millimeter.

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

Throughout 2025, MAGMA Indonesia has recorded 7,195 volcanic eruptions across Indonesia. Mount Semeru in East Java erupted the most (2,937 times) while Mount Marapi erupted 117 times.

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)