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Report on Ibu (Indonesia) — 22 May-28 May 2024


Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 22 May-28 May 2024
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2024. Report on Ibu (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 22 May-28 May 2024. Smithsonian Institution and US Geological Survey.

Weekly Report (22 May-28 May 2024)



1.488°N, 127.63°E; summit elev. 1325 m

All times are local (unless otherwise noted)

PVMBG reported that the eruption at Ibu continued during 22-28 May. White steam-and-gas plumes rose 200-600 m above the crater rim and drifted in multiple directions during 22-25 and 28 May. White-and-gray ash plumes rose 200-500 m and drifted SW, W, and N on 26 May. At 0303 on 27 May an eruptive event produced a white, gray, and black ash plume that rose 6 km above the crater rim and drifted SW and W. According to a news article ash fell in residential areas and at the Ibu observation post (9 km W). Incandescent material was ejected as far as 1 km from the vent onto the NW, W, SW, and S flanks. The Alert Level remained at 4 (the highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 7 km away from the N crater wall opening.

Geological Summary. The truncated summit of Gunung Ibu stratovolcano along the NW coast of Halmahera Island has large nested summit craters. The inner crater, 1 km wide and 400 m deep, has contained several small crater lakes. The 1.2-km-wide outer crater is breached on the N, creating a steep-walled valley. A large cone grew ENE of the summit, and a smaller one to the WSW has fed a lava flow down the W flank. A group of maars is located below the N and W flanks. The first observed and recorded eruption was a small explosion from the summit crater in 1911. Eruptive activity began again in December 1998, producing a lava dome that eventually covered much of the floor of the inner summit crater along with ongoing explosive ash emissions.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News