What is Subplinian eruption?
Introduction. Sub-Plinian eruptions produce higher eruption columns than Vulcanian eruptions, but are not as explosive as Plinian eruptions. Sub-Plinian eruption columns are usually less than 12 miles (20km) in height, and are unsteady but sustained. Composite volcanoes experience Sub-Plinian eruptions.
What is a Philian eruption?
Plinian eruptions or Vesuvian eruptions are volcanic eruptions marked by their similarity to the eruption of Mount Vesuvius in 79 AD, which destroyed the ancient Roman cities of Herculaneum and Pompeii. The key characteristics are ejection of large amount of pumice and very powerful continuous gas-driven eruptions.
When was the last ultra Plinian eruption?
Mt. Pinatubo, in the Phillipines,was the worlds last dramatic Plinian eruption in 1991.
What type of magma erupts most violently?
Plinian Eruption The largest and most violent of all the types of volcanic eruptions are Plinian eruptions. They are caused by the fragmentation of gassy magma, and are usually associated with very viscous magmas (dacite and rhyolite).
What type of eruption is the strongest?
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.
What type of volcano is the most violent eruption type?
Stratovolcanoes are considered the most violent. Mount St. Helens, in Washington state, is a stratovolcano that erupted on May 18, 1980.
What are the characteristics of a subplinian eruption?
The study of subplinian eruptions has revealed that an important distinguishing feature is the occurrence of high-frequency fluctuations or of temporary breaks in the discharge, with the repeated generation of short-lived convective plumes often alternated with phases of quiescence or of lower intensity, explosive or effusive activity.
What kind of eruption is a Plinian eruption?
In modern volcanology, the term “plinian” encompasses explosive eruptions characterized by the quasi-steady, hours-long, high-speed discharge into the atmosphere of a high-temperature, multiphase mixture (gas, solid, and liquid particles), forming a buoyant vertical column that reaches heights of tens of kilometers (` 29.1(A)).
What was the name of the volcano that destroyed Pompeii?
Plinian eruptions or Vesuvian eruptions are volcanic eruptions marked by their similarity to the eruption of Mount Vesuvius in 79 AD, which destroyed the ancient Roman cities of Herculaneum and Pompeii. The eruption was described in a letter written by Pliny the Younger, after the death of his uncle Pliny the Elder .
What was the name of the volcano that erupted in 1980?
Eruption columns of plinian and suplinian eruptions. Mount St. Helens (USA) during (A) and immediately after (B) the 1980 eruption; (C) and (D) 2011 eruption of Puyehue-Córdon Caulle (Chile). Note in (D) contemporaneous convective and collapsing regimes with pyroclastic flow generation.