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New Japan island: Volcanic eruption builds new island in Pacific Ocean

New Japan island: Ash and lava spewing out of the Pacific ocean have consolidated into a new island about 620 miles south of Tokyo, Japan.

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Japanese Coast Guard
A new volcanic island, called Nishino-shima, emerged from the Pacific ocean on Wednesday.
  • By Becky Oskin Livescience.com

Ash and lava fragments blasting out of the ocean announced the birth of a new volcanic island about 620 miles (1,000 kilometers) south of Tokyo in the Pacific Ocean.

The black cone is the newest member of the Bonin Islands, a chain of tropical and subtropical islands created by volcanic eruptions that includes Iwo Jima.

The eruption was heralded by several moderate earthquakes (around magnitude 4.5) on Nov. 18. Billowing steam and boiling seas appeared on Nov. 20 as the island raised above the sea offshore of Nishino-shima, a small island that marks the summit of a massive underwater volcano, according to the Japanese Coast Guard, which monitored the eruption by air. [Stunning Pictures: Japan's New Volcanic Island]

The island is still small: The volcanic crater is about 500 feet (150 meters) in diameter and the island itself is only 650 feet (200 m) wide and 980 feet (300 m) long, the Coast Guard reported on its website today (Nov. 21). The ash plume shot 2,000 feet (600 m) into the air.

This is the first time the giant submarine volcano beneath the sea has erupted since a major outpouring in 1973 to 1974 that created another small island, according to the Coast Guard.

Oceanic volcanic eruptions can leave lasting landmarks or vanish beneath pounding waves. The most famous example is Surtsey Island near Iceland, which appeared in 1973. Wind and waves have shrunk Surtsey nearly by half in the past four decades. Without fresh lava, the island could disappear completely.

If the new volcano, which has not yet been named, does erupt long enough to build a permanent island, it could play a role in ongoing territory disputes between Japan and China, according to news reports.

"If it becomes a full-fledged island, we would be happy to have more territory," government spokesman Yoshihide Suga told The Associated Press.

Email Becky Oskin or follow her @beckyoskin. Follow us @OAPlanet, Facebook & Google+. Original article onLiveScience's OurAmazingPlanet.

Copyright 2013 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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