Mount Semeru Erupted Again This Morning (Monday, 4 May 2026)
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Mount Semeru in East Java erupted again on Monday (4/5/2026) at 05:38 WIB. Only one eruption was recorded at Mount Semeru over the past week.
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 crater peak (4,176 meters above sea level).
The thick grey ash column drifted westward. This eruption registered on seismographs with maximum amplitude 22 mm and duration 134 seconds.
(Related: Jakarta Flood Point Distribution (23 January 2026, 07:00 WIB))
As per MAGMA Indonesia volcanic activity reports, Mount Semeru remains at Alert Level III. Seismic monitoring on 4 May 2026 between 18:00–23:59 WIB recorded 16 eruption earthquakes (amplitude 12–22 mm, duration 63–189 seconds), 6 degassing earthquakes (5–6 mm amplitude, 59–67 seconds duration), and 2 distant tectonic earthquakes (20–35 mm amplitude, S-P interval 14–19 seconds, 65–74 seconds duration).
PVMBG has prohibited all activities in the southeast sector along Besuk Kobokan within 13 km of the peak. Outside this zone, public activities are also banned within 500 m of Besuk Kobokan river banks, as pyroclastic surges and lahars may reach up to 17 km from the summit.
For the year 2026, MAGMA Indonesia has logged 1,775 volcanic eruptions nationwide. Mount Semeru alone accounts for 913 of these events.
(Related: Damaged Housing Count: Sumatra Floods & Landslides (16 December 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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