TEMPO.CO, Jakarta - The highest volcano in Java, Mount Semeru, erupted again late Tuesday, April 7, 2026, spewing an ash column about 2,000 meters high above the summit, twice the height of the previous eruption on April 3.
Liswanto, an officer at the Semeru Volcano Observation Post (PGA) in Lumajang, East Java, reported that the ash column was heavily inclined towards the northeast and east. The eruption was recorded on the seismogram with a maximum amplitude of 27 mm and a duration of 7 minutes 23 seconds.
The eruption of Mount Semeru also emitted hot cloud. Liswanto stated in his report on Tuesday, April 7, 2026, "The Pyroclastic Flow (APG), with a sliding distance of 4,500 meters from the crater, is headed southeast (Besuk Kobokan)."
Isnugroho, the Acting Head of the Regional Disaster Mitigation Agency (BPBD) in Lumajang, confirmed the hot cloud, but said it did not affect the residents.
Mount Semeru's volcanic activity remains at alert Level III.
The Center for Volcanology and Geological Hazard Mitigation (PVMBG) issued several recommendations following the eruption. Residents are encouraged to avoid activities in the southeastern sector along Besuk Kobokan, up to 13 kilometers from the summit (eruption center).
Beyond this distance, surrounding communities should not engage in activities within 500 meters from the river edge along Besuk Kobokan due to the potential expansion of hot clouds and lava flow up to 17 kilometers from the peak. They should not be active within a 5-kilometer radius from the crater/peak of Mount Semeru due to the risk of projectile eruption materials.
Overall, residents are advised to be vigilant of the potential hot clouds, lava flows, and cold lava floods along the river/valley originating from the peak of Mount Semeru, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lava floods on small rivers that are tributaries of Besuk Kobokan.
Read: Mount Semeru Erupts Twice This Morning, Alert Maintained at Level III
Click here to get the latest news updates from Tempo on Google News
Mount Semeru Erupts Twice This Morning, Alert Maintained at Level III
12 hari lalu
The volcanic activity alert status of Mount Semeru remains at Level III.
Geological Agency Warns of Repeated Hot Clouds at Mount Semeru
52 hari lalu
The Indonesian Geological Agency assesses that Mount Semeru's volcanic activity remains high.
Mount Semeru Erupts Twice After Midnight, Alert Status Maintained
5 Februari 2026
Mount Semeru erupted again early Thursday, February 5, 2026, at 12:13 a.m. Western Indonesian Time (WIB).
Mount Semeru Erupts Seven Times From Dawn to Morning
4 Februari 2026
Mount Semeru's consecutive eruptions were reported from after dawn until this morning, Wednesday, February 4, 2026.
Mount Semeru Emits Hot Clouds for Two Days, Alert Level Remains High
16 Januari 2026
During the period of January 7-14, 2026, Mount Semeru's volcanic activity remains high with frequent occurrences of pyroclastic flows.
Volcanic Activity at Indonesia's Mount Semeru Remains High
15 Januari 2026
A total of 36 eruption earthquakes were recorded at Mount Semeru from early Thursday to 06:00 AM local time.
Mount Semeru Spews Pyroclastic Flows and Lava Floods
14 Januari 2026
Mount Semeru erupted on Wednesday with pyroclastic flows and seismic tremors. Authorities maintain a Level III Alert.
Fact Check: Viral Mount Semeru Eruption Video Was AI-Edited
13 Januari 2026
Fact check - The video circulating has been edited using AI from the original footage.
Mount Marapi Erupts in West Sumatra, Spewing Ash 1.2 Km High
15 Desember 2025
Mount Marapi in West Sumatra experienced another eruption on Sunday evening, December 14, 2025.
BMKG Warns Prolonged Rain Could Trigger Mount Semeru Mudflows
5 Desember 2025
BMKG has warned of possible mudflows and flash floods on Mount Semeru in East Java after morning rainfall on December 5, 2025.
