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One of the world's most dangerous volcanoes was found to actually have produced a far higher rate of highly destructive VEI 4 and VEI 5 eruptions in the last 5,000 years. This means that the Mount Agung volcano has a greater risk of producing a repeat eruption during its next eruptive sequence when compared to the previous perception. This video outlines why this is the case, and what the new data means in the context of the overall volcano.
Note: For this video thumbnail, a "very large eruption" means any eruption which is VEI 4 or larger.
Thumbnail Photo Credit: This work "AgungImg1", is a derivative of a photo (resized, cropped, text overlay, brightness increased, saturation increased, overlaid with GeologyHub made graphics (the image border & the GeologyHub logo)) from "Indonesian postcard (gunung Agung)", by: madras91, 2017, Posted on Flickr, Flickr account link: www.flickr.com/photos/9657966..., Photo link: www.flickr.com/photos/9657966..., CC BY 2.0. "AgungImg1" is used & licensed under CC BY 2.0 by / geologyhub
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Sources/Citations:
[1] Fontijn, Karen & Costa, Fidel & Sutawidjaja, Igan & Newhall, Chris & Herrin, Jason. (2015). A 5000-year record of multiple highly explosive mafic eruptions from Gunung Agung (Bali, Indonesia): implications for eruption frequency and volcanic hazards. Bulletin of Volcanology. 77. 10.1007/s00445-015-0943-x.
[2] Self, Stephen & Rampino, Michael. (2012). The 1963-1964 eruption of Agung volcano (Bali, Indonesia). Bulletin of Volcanology. 74. 10.1007/s00445-012-0615-z.
[3] Syahbana, D.K., Kasbani, K., Suantika, G. et al. The 2017-19 activity at Mount Agung in Bali (Indonesia): Intense unrest, monitoring, crisis response, evacuation, and eruption. Sci Rep 9, 8848 (2019). doi.org/10.1038/s41598-019-45..., CC BY 4.0. The Google Earth outline of the pyroclastic flow deposits from the 1963 eruption was roughly traced from figure 1A in this scientific paper.
[4] 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 / geologyhub on Oct 5th, 2022.
[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), www2.bgs.ac.uk/vogripa/view/c..., Used with Permission
0:00 A Destructive Eruption
1:23 Not an Outlier
2:12 Overall Ranking
3:22 Heightened Eruptive Rate Periods
4:35 Conclusion