Alert! Mount Semeru Erupts Again Tonight (Wednesday, 17 June 2026)
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Mount Semeru in East Java erupted again on Wednesday (17/6/2026) at 18:54 WIB. Over the past week, Mount Semeru has erupted 32 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 500 meters above the summit (4,176 meters above sea level).
The ash column appeared white to grey, with thick intensity drifting northwards. The eruption was recorded on seismograph with maximum amplitude 22 mm and duration 129 seconds.
(Read: Floods: The Most Frequent Natural Disaster Striking Indonesia as of September 2025)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently set at Activity Level III (Alert Status). Seismic monitoring on 17 June 2026 between 12:00-18:00 WIB recorded 19 eruption earthquakes with amplitude 11-22 mm and duration 88-134 seconds.
Additionally, 1 degassing earthquake with 5 mm amplitude / 50 second duration, plus 2 distant tectonic earthquakes with amplitude 10-28 mm, S-P interval 22-25 seconds and duration 50-63 seconds were detected.
PVMBG urges all activity is prohibited in the southeast sector along Besuk Kobokan up to 13 km from the summit. Outside this zone, public activity is forbidden within 500 meters of Besuk Kobokan river banks, as hot cloud surges and lahar flows may reach up to 17 km from the peak.
During 2026, MAGMA Indonesia has logged 2,743 volcanic eruptions across Indonesia. East Java's Mount Semeru has recorded the highest activity with 1,283 eruptions.
(Read: Floods Dominated Natural Disasters in Indonesia Late February 2024)
"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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