Mount Semeru Erupts Again Tonight, Eruption Height Reaches 300 Meters Above Summit Peak
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Mount Semeru in East Java erupted again on Monday (4/5/2026) at 19:28 WIB. Over the past week, Mount Semeru has erupted 10 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached approximately 300 meters above the summit (3,976 meters above sea level).
The ash column appeared white to grey with moderate intensity, drifting southward. Mount Semeru eruption was still ongoing at the time this report was published.
(Read: Jatibening Listed Among 15 Areas With Best Air Quality in Indonesia as of September 2023)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru activity status is set at Level III (Alert). Seismic monitoring on May 4 2026 between 12:00-18:00 WIB recorded 16 eruption earthquakes with 10-22 mm amplitude and 62-172 second duration.
Additionally, 1 emission earthquake (8 mm amplitude, 51 second duration) and 1 harmonic tremor (4 mm amplitude, 568 second duration) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, public activity is prohibited within 500 meters of river banks along Besuk Kobokan, as this area is at risk of pyroclastic surge expansion and lahar flows reaching up to 17 km from the summit.
During 2026, MAGMA Indonesia has recorded a total of 1,787 volcanic eruptions across Indonesia. East Java's Mount Semeru recorded the highest activity with 922 eruptions.
(Read: Majority of Indonesians Obtain Air Quality Information From Social Media)
"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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