- #1
- 21,869
- 6,259
Super-eruptions may give only a year’s warning before they blow
http://news.vanderbilt.edu/2016/07/super-eruptions-may-give-only-a-years-warning-before-they-blow/
In a paper entitled “The year leading to a supereruption” by Guilherme Gualda, associate professor of Earth and environment sciences at Vanderbilt University, and Stephen Sutton at the University of Chicago published July 20 in the journal PLOS One, the scientists report the results of a new microscopic analysis of quartz crystals in pumice taken from the Bishop Tuff in eastern California, which is the site of the super-eruption that formed the Long Valley Caldera 760,000 years ago.
https://en.wikipedia.org/wiki/Phlegraean_Fields (Campi Flegrei)
https://en.wikipedia.org/wiki/Taupo_Volcano
https://en.wikipedia.org/wiki/1815_eruption_of_Mount_Tambora
https://en.wikipedia.org/wiki/Toba_catastrophe_theory
It would be interesting to review the compositions of the cited super-eruptions.
http://news.vanderbilt.edu/2016/07/super-eruptions-may-give-only-a-years-warning-before-they-blow/
“The evolution of a giant, super-eruption-feeding magma body is characterized by events taking place at a variety of time scales,” said Gualda. Tens of thousands of years are needed to prime the crust to generate sufficient eruptible magma. Once established, these melt-rich, giant magma bodies are unstable features that last for only centuries to few millennia. “Now we have shown that the onset of the process of decompression, which releases the gas bubbles that power the eruption, starts less than a year before eruption.”
In a paper entitled “The year leading to a supereruption” by Guilherme Gualda, associate professor of Earth and environment sciences at Vanderbilt University, and Stephen Sutton at the University of Chicago published July 20 in the journal PLOS One, the scientists report the results of a new microscopic analysis of quartz crystals in pumice taken from the Bishop Tuff in eastern California, which is the site of the super-eruption that formed the Long Valley Caldera 760,000 years ago.
Since pumice is formed from super-heated, highly pressurized rock that is violently ejected from a volcano, I assume it is produced in super-eruptions, since they are super-sized because of the gas in the magma.Very large eruptions – including super-eruptions – have taken place in a number of places worldwide in the recent geological past. The Taupo Volcanic Zone in New Zealand was the site of the most recent super-eruption – the Oruanui eruption at 26,500 years – and it includes deposits from more than a dozen very large eruptions that took place in the last couple of million years. Campi Flegrei in Italy produced a very large eruption 40,000 years ago. Indonesia was the site of the Toba super-eruption in Sumatra 75,000 years ago and the Tambora eruption in 1815. In the United States, Yellowstone has experienced three super-eruptions over the last two million years. In light of this evidence, it seems inevitable that another super-eruption will strike the Earth in the future.
https://en.wikipedia.org/wiki/Phlegraean_Fields (Campi Flegrei)
https://en.wikipedia.org/wiki/Taupo_Volcano
https://en.wikipedia.org/wiki/1815_eruption_of_Mount_Tambora
https://en.wikipedia.org/wiki/Toba_catastrophe_theory
It would be interesting to review the compositions of the cited super-eruptions.