Mount Semeru Erupted Again This Morning, Ash Column Height Around 900 Meters
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Mount Semeru in East Java erupted again on Monday (5/4/2026) at 08:53 WIB. Over the past week, Semeru has erupted 6 times.
Per Indonesia's PVMBG MAGMA application, the observed ash column reached 900 m above the summit (4576 m above sea level), appearing white-grey thick drifting southwest. This eruption registered max 23 mm seismograph amplitude over 127 seconds.
Mount Semeru remains at Alert Level III. Authorities prohibit activity within 13 km of the peak, and 500 m from Besuk Kobokan river banks due to lahar hazards. As of 2026, Semeru recorded 918 out of 1782 total volcanic eruptions nationwide.
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