In 2007, the summit of France's Piton de la Fournaise volcano rapidly dropped by more than 1,000 feet. This occurred due to largest historical eruption by volume of that volcano, which effused more than 200 million cubic meters of lava at a flank vent. Today's video discusses that eruption, and explains why a 21 square kilometer swaths of the volcano moved by up to 1.4 meters due to that eruption. Thumbnail Photo Credit: This work "ReunionVolcano5", is a derivative of a photo (resized, cropped, increased image color saturation, text overlay, overlaid with GeologyHub made graphics (the image border & the GeologyHub logo)) from "Piton de la Fournaise", by: Gilles Bassière, gilles.bassiere, 2015, Posted on Flickr, Flickr account link: https://www.flickr.com/photos/31379880@N05/, Photo link: https://www.flickr.com/photos/31379880@N05/23166395101/, CC BY 2.0. "ReunionVolcano5" is used & licensed under CC BY 2.0 by Youtube.com/GeologyHub 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): CC BY 2.0: https://creativecommons.org/licenses/by/2.0/legalcode CC BY 3.0: https://creativecommons.org/licenses/by/3.0/legalcode CC BY 4.0: https://creativecommons.org/licenses/by/4.0/legalcode Sources/Citations: [1] Dumont, Q., Cayol, V., Froger, JL. et al. 22 years of satellite imagery reveal a major destabilization structure at Piton de la Fournaise. Nat Commun 13, 2649 (2022). https://doi.org/10.1038/s41467-022-30109-w, CC BY 4.0. [2] Derrien, Allan & Peltier, Aline & Villeneuve, Nicolas & Staudacher, Thomas. (2020). The 2007 caldera collapse at Piton de la Fournaise: new insights from multi-temporal structure-from-motion. Volcanica. 3. 55-65. 10.30909/vol.03.01.5565. CC BY 4.0. [3] Daniele Vergani, Jocelyn McPhie, Rebecca Carey, Andrea Di Muro, Rootless littoral hydrovolcanic explosions and deposits, 6 April 2007, Piton de la Fournaise, La Réunion Island, Journal of Volcanology and Geothermal Research, Volume 466, 2025, 108412, ISSN 0377-0273, https://doi.org/10.1016/j.jvolgeores.2025.108412. (https://www.sciencedirect.com/science/article/pii/S0377027325001489), CC BY 4.0. [4] Vergani, D., McPhie, J., Carey, R. et al. Intracaldera explosions and lava emissions during the 2007 caldera collapse of Piton de la Fournaise, La Réunion Island. Bull Volcanol 84, 19 (2022). https://doi.org/10.1007/s00445-022-01528-w, CC BY 4.0. [5] 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 are sourced from the LaMEVE database (British Geological Survey © UKRI), https://www2.bgs.ac.uk/vogripa/view/controller.cfc?method=lameve, Used with Permission [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] Observatoire Volcanologique de Piton de la Fournaise (OVPF) (Réunion Island) [8] https://imaggeo.egu.eu/ 0:00 A Caldera Collapse 0:41 Not Kilauea 1:06 Piton de la Fournaise 2:00 2007 Eruption