Warning! Mount Semeru Erupts Again This Afternoon (Friday, April 17, 2026)

Mount Semeru in East Java erupted again on Friday (April 17, 2026) at 17:16 WIB. In the last week, Mount Semeru has erupted 42 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 is around 700 meters above the peak or 4,376 meters above sea level.

The observed ash column is gray in color with thick intensity towards the southwest. The eruption was recorded on the seismograph with a maximum amplitude of 22 millimeters and a duration of 100 seconds.

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According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level III (Alert). Earthquake observations on April 17, 2026, from 06:00-12:00 WIB showed 15 eruption/explosion earthquakes with amplitudes of 15-22 millimeters and earthquake durations of 75-154 seconds.

Then, 4 emission earthquakes with amplitudes of 2-6 millimeters and earthquake durations of 40-87 seconds, as well as 1 harmonic earthquake with an amplitude of 2 millimeters and an earthquake duration of 130 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, within 13 kilometers of the peak (eruption center). Outside this distance, residents should not carry out activities within 500 meters of the riverbank along the Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 1,529 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 817 explosions.

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