Alert! Mount Semeru Erupts Again Tonight (Saturday, 17 October 2026)
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Mount Semeru in East Java erupted again on Saturday (17/10/2026) at 19:07 WIB. Over the past week, Mount Semeru has erupted 48 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approximately 500 meters above the summit (4,176 meters above sea level).
The ash column appeared white to grey with moderate intensity, drifting southwest. Semeru's eruption was ongoing when this report was published.
(Read: Indonesia Has The Most Active Volcanoes In The World)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently at Alert Level III (Standby). Seismic monitoring on 17 October 2026 between 12:00-18:00 WIB recorded 25 eruption earthquakes with 10-22 mm amplitude and 58-138 second duration.
Additionally, 6 rockfall earthquakes (3-6 mm amplitude, 48-94 seconds) and 5 emission earthquakes (4-8 mm amplitude, 44-73 seconds) were detected.
PVMBG prohibits all activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, residents must avoid activity within 500 meters of Besuk Kobokan river banks, as hot cloud surges and lahar flows may reach up to 17 km from the peak.
For the full year 2026, MAGMA Indonesia has logged 5,160 volcanic eruptions nationwide. East Java's Mount Semeru accounts for the highest count at 2,006 eruptions.
"Disclosure: This is an AI-generated translation of the original article. We strive for accuracy, but please note that automated translations may contain errors or slight inconsistencies."
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