Phreatomagmatic eruption

Table of Contents☰

About Phreatomagmatic eruption

A new island near Japan’s Ogasawara island chain was formed by a 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 the 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.

Q1) What is a volcano?

A volcano is a geological formation on the Earth’s surface that occurs when magma, volcanic ash, and gases escape from below the Earth’s crust through an opening called a vent. Volcanoes can take various forms, ranging from stratovolcanoes (composite volcanoes) to shield volcanoes and cinder cone volcanoes.

Source: New island is born in Japan after undersea volcanic eruption