Krakatau, the infamous volcano, just produced its largest explosive eruption since 1883. And this caused the cancellation of hundreds of flights, generated a massive eruption plume, and caused ash to fall across a wide area. Yet, how large is this eruption, and why might it have occurred? Today's video will attempt to answer these questions through the knowledge & analysis of a geologist. Note: This video's thumbnail image displays a 2018 eruption plume at Kilauea. I am using it to represent Krakatau's September 2026 eruption. A special thanks to the Extreme Pursuit YouTube channel for granting me permission to use clips of his footage! Video Sources from the Extreme Pursuit YouTube channel: [1] https://www.youtube.com/watch?v=pspg1_1hM8Y [2] https://www.youtube.com/watch?v=YnUvb-KeH5I Extreme Pursuit channel link: https://www.youtube.com/ExtremePursuit YouTube Creative Commons Video Source, this video source linked here falls under a CC BY 4.0 license: [1] INGVvulcani, https://www.youtube.com/watch?v=kaqZsDuGAxM NASA EOSDIS Worldview satellite imagery Copyright © 2012-2026 United States Government as represented by the Administrator of the National Aeronautics and Space Administration. All Rights Reserved. Associated license for NASA EOSDIS Worldview: https://github.com/nasa-gibs/worldview/blob/main/LICENSE.md We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Observing System Data and Information System (EOSDIS). We acknowledge the use of imagery from the NASA Worldview application (https://worldview.earthdata.nasa.gov/), part of the NASA Earth Observing System Data and Information System (EOSDIS). If you would like to support this channel, consider using one of the following links: (Patreon: http://patreon.com/geologyhub) (YouTube membership: https://www.youtube.com/channel/UCYeGh5VML5XPr5jYnzh3J6g/join) (Gemstone & Mineral Etsy store: http://prospectingarizona.etsy.com) (GeologyHub Merch Etsy store: http://geologyhub.etsy.com) Google Earth imagery used in this video: ©Google & Data Providers This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes. Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image): Public Domain: https://creativecommons.org/publicdomain/mark/1.0/ CC BY 4.0: https://creativecommons.org/licenses/by/4.0/legalcode Sources/Citations: [1] Hunt, J.E., Tappin, D.R., Watt, S.F.L. et al. Submarine landslide megablocks show half of Anak Krakatau island failed on December 22nd, 2018. Nat Commun 12, 2827 (2021). https://doi.org/10.1038/s41467-021-22610-5, CC BY 4.0. [2] Meredew, K., Watt, S.F.L., Cassidy, M. et al. Forecasting future instability hazards at Anak Krakatau volcano, Indonesia, using archival reconstructions of edifice evolution. Bull Volcanol 88, 57 (2026). https://doi.org/10.1007/s00445-026-01974-w, CC BY 4.0. [3] NASA Worldview, EOSDIS Worldview, (Satellite imagery: NOAA-20 / VIIRS, Aqua / MODIS), at https://worldview.earthdata.nasa.gov/ [4] VEIs, dates/years, composition, tephra layer name, DRE estimates, and bulk tephra volume estimates for volcanic eruptions shown in this video which were assigned a VEI 4 or larger and are not the 2026 Krakatau eruption are sourced from the LaMEVE database (British Geological Survey © UKRI), https://www2.bgs.ac.uk/vogripa/view/controller.cfc?method=lameve, Used with Permission [5] PVMBG (Pusat Vulkanologi dan Mitigasi Bencana Geologi) (Indonesia) [6] Source of Volcanic Explosivity Index (VEI) methodology and criteria: Newhall, C. G., and Self, S. (1982), The volcanic explosivity index (VEI) an estimate of explosive magnitude for historical volcanism, J. Geophys. Res., 87(C2), 1231–1238, doi:10.1029/JC087iC02p01231. Accessed / Read by Youtube.com/GeologyHub on Oct 5th, 2022. [7] J. Ewert, A. Diefenbach, D. Ramsey, "2018 Update to the U.S. Geological Survey National Volcanic Threat Assessment", U.S. Geological Survey, Accessed October 22, 2022. https://pubs.usgs.gov/sir/2018/5140/sir20185140.pdf [8] YouTube Creative Commons, "Parossismo al Cratere di Sud-Est dell'Etna, 10 febbraio 2022: flussi piroclastici", Boris Behncke, INGV-Osservatorio Etneo, 2022, INGVvulcani, INGVvulcani channel link: https://www.youtube.com/INGVvulcani, Source video link: https://www.youtube.com/watch?v=kaqZsDuGAxM, CC BY 4.0 license. 0:00 Major Krakatau Eruption 1:58 Eruption Size 3:01 Possible Effects 4:12 Eruption Cause