Phreatomagmatic eruption

About 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.

Key facts about 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.