Alaska's Little Known Submerged Volcano; The Addington Maar скачать в хорошем качестве

Alaska's Little Known Submerged Volcano; The Addington Maar

Approximately 13,000 years ago, a powerful series of explosions blew a 4,000 foot wide & 900 foot deep crater in the ground. Large amounts of ash were also ejected in this volcanic eruption, causing multiple inches thick of material to fall more than 25 miles away. This all occurred at a volcano which was only recently discovered in 2011 that is known as the Addington Volcanic Field. It is not located close to a subduction zone, but rather just offshore of the Panhandle of Alaska. Thumbnail Photo Credit: Google Earth, Image IBCAO, Data SIO, NOAA, U.S. Navy, NGA, GEBCO, Image Landsat / Copernicus, Data LDEO-Columbia, NSF, NOAA. This image was overlaid with text, and then overlaid with GeologyHub made graphics (the image border & the GeologyHub logo). If you would like to support this channel, consider using one of the following links: (Patreon:   / geologyhub  ) (YouTube membership:    / @geologyhub  ) (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/publicdom... Sources/Citations: [1] U.S. Geological Survey [2] Alaska Volcano Observatory [3] Wilcox, P.S., 2017, 60,000 year climate and vegetation history of Southeast Alaska: Fairbanks, University of Alaska Fairbanks Ph.D. dissertation, 101 p. [4] Wilcox, Paul & Addison, Jason & Fowell, Sarah & Baichtal, James & Severin, Ken & Mann, Daniel. (2019). A new set of basaltic tephras from Southeast Alaska represent key stratigraphic markers for the late Pleistocene. Quaternary Research. 92. 1-11. 10.1017/qua.2018.154. [5] University of Alaska Fairbanks, Geophysical Institute [6] 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 Addington Volcanic Field are sourced from the LaMEVE database (British Geological Survey © UKRI), https://www2.bgs.ac.uk/vogripa/view/c..., Used with Permission [7] Phivolcs 0:00 Alaskan Volcanoes 1:25 Addington Volcanic Field 1:43 A Large Crater 2:30 Geologic Setting 3:29 Decompression Melting 3:51 Ancient Eruption