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Report on Ibu (Indonesia) — 13 May-19 May 2020

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 13 May-19 May 2020
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2020. Report on Ibu (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 13 May-19 May 2020. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (13 May-19 May 2020)


Ibu

Indonesia

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

All times are local (unless otherwise noted)


The Darwin VAAC reported that on 16 May an ash plume from Ibu rose to 1.8 km (6,000 ft) a.s.l. and drifted NW based on satellite images and weather models. Later that day an ash plume rose to 13.7 km (45,000 ft) a.s.l., detached from the volcano and drifted S, and quickly dissipated. Ash plumes rose to 4.3 (14,000 ft) a.s.l. and drifted W during 17-18 May. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.

Geologic Background. 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, contained several small crater lakes through much of historical time. The outer crater, 1.2 km wide, is breached on the north side, creating a steep-walled valley. A large parasitic cone is located ENE of the summit. 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. Only a few eruptions have been recorded in historical time, the first a small explosive eruption from the summit crater in 1911. An eruption producing a lava dome that eventually covered much of the floor of the inner summit crater began in December 1998.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)