On October 31st, 1924, one of the largest volcanic eruptions in recent human history occurred southwest of the island of Okinawa in Japan. Yet, very few people know about this eruption and the volcano which produced it, with the eruption rating on the volcanic explosivity index as a 5. This video was discuss this eruption which everyone seemingly forgot about that originated from the Iriomotejima submarine volcano.

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Graphics of eruption dates are courtesy of the Global Volcanism Program, Smithsonian Institution. https://volcano.si.edu/
Images with a list of eruption dates have their dates sourced from the GVP of the Smithsonian Institution.
Citation: Global Volcanism Program, 2013. Volcanoes of the World, v. 4.11.2 (02 Sep 2022). Venzke, E (ed.). Smithsonian Institution. Downloaded 25 Sep 2022. https://doi.org/10.5479/si.GVP.VOTW4-2013.

Google Earth imagery used in this video: ©Google & Data Providers

Thumbnail Photo Credit: NOAA & NSF, NOAA Photo Library, Public Domain

Creative Commons Licenses used for specific content or sections of specific content (such as a photo within a table) in this video (not the entire video):
CC0 1.0: https://creativecommons.org/publicdomain/zero/1.0/legalcode
CC BY 2.0: https://creativecommons.org/licenses/by/2.0/legalcode

Sources:
[1] Global Volcanism Program, 2013. Submarine Volcano NNE of Iriomotejima (282010) in Volcanoes of the World, v. 4.11.2 (02 Sep 2022). Venzke, E (ed.). Smithsonian Institution. Downloaded 25 Sep 2022 (https://volcano.si.edu/volcano.cfm?vn=282010). https://doi.org/10.5479/si.GVP.VOTW4-2013
[2] Global Volcanism Program, 2013. Volcanoes of the World, v. 4.11.2 (02 Sep 2022). Venzke, E (ed.). Smithsonian Institution. Downloaded 25 Sep 2022. https://doi.org/10.5479/si.GVP.VOTW4-2013.
[3] U.S. Geological Survey. Mount Saint Helens, 1980 Cataclysmic Eruption. https://www.usgs.gov/volcanoes/mount-st.-helens/1980-cataclysmic-eruption#:~:text=Within%20less%20than%2015%20minutes,northward%20from%20the%20former%20summit.
[4] U.S. Geological Survey. Mount Saint Helens. https://www.usgs.gov/volcanoes/mount-st.-helens/science/faqs#:~:text=Helens%20fell%20over%20an%20area,(240%20kilometers)...
[5] NOAA
[6] NASA Worldview, EOSDIS Worldview, Terra / Modis

Image Sources:
Eruption plume above the clouds: https://www.flickr.com/photos/gsfc/48132762546
Rhyolite pumice: https://www.flickr.com/photos/jsjgeology/31547041072
Komatiite: https://www.flickr.com/photos/jsjgeology/40876562433/
Carbonatite: https://www.flickr.com/photos/jsjgeology/14842433453
Natrocarbonatite: https://www.flickr.com/photos/jsjgeology/14842478933

Note: Usage of NASA imagery does NOT convey an endorsement of this youtube channel, GeologyHub, or any advertisements shown at the beginning, during the video, or at the end of this video.

0:00 Mount Saint Helens 1980 Eruption, VEI = 5
0:33 Lateral Blast
1:08 Volcanic Explosivity Index
1:39 Other 20th Century Large Eruptions
2:01 A Forgotten Explosive Eruption
2:20 Geologic Setting & Location
2:46 Volcano Information
3:00 Composition
4:20 Conclusion