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Ultra-Plinian. In 1980, volcanologist George P. L. Walker proposed Hatepe eruption as the representative of a new class called ultra-Plinian deposits, based on its exceptional dispersive power and eruptive column height. A dispersal index of 50,000 square kilometres (19,000 sq mi) has been proposed as a cutoff for an ultra-Plinian ...
Erupção pliniana é a designação dada a um tipo de erupção vulcânica caracterizada pela sua grande explosividade. O nome surgiu quando os cientistas comprovaram que Plínio o Novo (romano que morava na baía de Nápoles) tinha descrito corretamente o evento catastrófico relacionado ao Vesúvio, na grande explosão que ...
The stronger eruptive types are Pelean eruptions, followed by Plinian eruptions; the strongest eruptions are called Ultra-Plinian. Subglacial and phreatic eruptions are defined by their eruptive mechanism, and vary in strength.
The volcanic explosivity index ( VEI) is a relative measure of the explosiveness of volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982.
14 de abr. de 2023 · Ultra-Plinian eruptions are the largest of all volcanic eruptions, and are so voluminous that large calderas form above vacated magma chambers. These eruptions are more intense and have a higher eruption rate than Plinian ones and form higher eruption columns.
The eruption was of the Ultra Plinian type, and it resulted in an estimated 30 to 35 km (19 to 22 mi) high eruption column which reached the stratosphere. In addition, the magma underlying the volcano came into contact with the shallow marine embayment, resulting in violent phreatomagmatic blasts.
17 de fev. de 2016 · To reconstruct the volume, intensity, and duration of the tephra dispersal, we applied a computational inversion method that explicitly accounts for the Plinian and co-ignimbrite phases and for...
