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Archive for the ‘Japan Volcano’ Category

Volcanic Vent at Owakudani Valley near Tokyo Erupts

Posted by feww on June 30, 2015

Mt. Hakone erupts spewing ash and steam

A “minor volcanic eruption” has occurred at Mt Hakone near Tokyo starting Monday night through Tuesday, according to officials.

Fresh layers of volcanic ash were discovered Tuesday morning around a newly-formed vent in the Owakudani valley, which forms part of the Mount Hakone range (Fuji-Hakone-Izu National Park) located in Kanagawa prefecture.

Volcanic tremors have been shaking the Hakone mountain since Monday morning, officials said, warning nearby residents that the volcano could eject sizable rocks to a radius of about one kilometer and smaller rocks even further.

The warning level on the Hakone was  raised to level 3 [“Do not approach the volcano,”] at 12:30 JST today [June 30,  2015.]

The volcano has been ejecting steam over the past few months.

Mt Hakone is located about 80 km SW of central Tokyo. More than 45 million people live within a 100-km radius of the volcano according to FIRE-EARTH Population Models.

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Submarine Volcano Erupts Near Japan

Posted by feww on February 6, 2010

Fukutokuokanoba submarine volcano erupts

White smoke was observed rising from the sea about five kilometers north-northeast of the Minami-Iwoto island in Ogasawara Islands, a Japanese coast guard patrol vessel reported, Yomiuri Shimbun said.

Smoke believed to be emanating from an underwater volcano was previously detected in the area, about 1,200 kilometers south of central Tokyo, in July 2005.

Tokyo Institute of Technology geoscience Professor, Kenji Nogami, reportedly said: “In the 1986 eruption, a new island appeared after lava accumulated. The island was washed away by waves, but seabed upheaval reduced the water depth to 22 meters in 1999. It’s possible that this [recent] volcanic activity could form a permanent island.”


Location Map, Volcano Islands, Ogasawara Islands, Japan. Image credit: Lim Tor


Bonin Islands (aka, Ogasawara Group, in Japan).  Click Image to Enlarge.

The volcano reportedly ejected  smoke and ash to a height of about about 100 meters above the sea level. The surrounding sea area was reported as changing to a greenish yellow color with other nearby areas turning cloudy.

Japan’s Meteorological Agency (JMA) said the volcano, called Fukutokuokanoba, has erupted seven times since 1904, forming ephemeral islands (temporary land masses) on three occasions, all of which later sank below the ocean surface.

The first known ephemeral island called Shin-Iwo-jima (New Sulfur Island) was formed in 1904, and the most recent in 1986.

What the Volcano Islands Look Like


North Iwo Jima Island (Official Japanese name Kita-iōtō, but commonly known as Kita-iōjima, meaning “north sulfur island”) is the northernmost island of the Volcano Islands cluster of the Ogasawara Islands, about 1175 km south of Tokyo. Image Credit: Chisatos

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