Mount Semeru Erupted Again Early This Morning (Wednesday, 23 September 2026)
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Mount Semeru in East Java erupted again on Wednesday (23/9/2026) at 04:47 WIB. Over the past week, Mount Semeru has erupted 6 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, or 4,176 meters above sea level.
The ash column appeared white to grey, with thick intensity drifting southeast and south. This eruption was recorded on seismographs with a maximum amplitude of 22 millimeters and lasted 115 seconds.
(Read: From Earthquakes to Drought: These are the Most Common Natural Disasters in Indonesia up to Mid 2023)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently set at Activity Level III (Alert Status). Seismic monitoring between 18:00–23:59 WIB on 23 September 2026 recorded 23 eruption earthquakes with 10–22 mm amplitude and 68–128 second duration.
Additionally, 15 rockfall earthquakes (2–9 mm amplitude, 33–113 seconds) and 5 emission tremors (4–8 mm amplitude, 23–51 seconds) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, civilians must avoid a 500 meter riverbank buffer along Besuk Kobokan, as pyroclastic surges and lahar flows may reach up to 17 km from the crater.
For the full year 2026, MAGMA Indonesia has logged 4,755 volcanic eruptions nationwide. East Java's Mount Semeru recorded the highest activity with 1,843 eruptions.
(Read: Indonesia Ranked as Country Most Frequently Hit by Earthquakes as of 2025)
"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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