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Phreatomagmatic Eruption

Kumari Sonali

Phreatomagmatic Eruption:

A new island near Japan’s Ogasawara island chain was formed by phreatomagmatic eruption.

  • It is an eruption that involves both magma and water. It typically interacts explosively leading to concurrent ejection of steam and pyroclastic fragments.
  • Phreatomagmatic ash is formed by the same mechanism over a wide range of basic and acidic compositions. A blocky and uniform crust with low vesicle content is formed.
  • Deposits from phreatomagmatic eruptions are thought to be better classified and finer-grained than those from magmatic eruptions.
  • This is the result of higher fragmentation of phreatomagmatic eruptions.

Ogasawara Islands:

  • The Ogasawara Islands are located in the North-Western Pacific Ocean.
  • It is also known as Bonin Islands.
  • It is a volcanic arc comprising more than 30 islands and islets.
  • The landscape is dominated by subtropical forest types and sclerophyllous shrublands surrounded by steep cliffs.
  • It is one of the famous UNESCO World Heritage sites of Japan.

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