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Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié par Bernard Duyck
Publié dans : #Actualités volcaniques
Zaosan - the Okama crater and his crater lake - photo Wiki

Zaosan - the Okama crater and his crater lake - photo Wiki

JMA has set an alert for the area around the crater Zaosan this April 13, because of the potential risk of minor eruption.
 

Warning to the vicinity of the crater Zaosan 04/13/2015 - Doc. JMA

Warning to the vicinity of the crater Zaosan 04/13/2015 - Doc. JMA

The Zaosan volcanic group is located in the northeast of the main island Honshu, in the Japanese archipelago.

It includes a series of stratovolcanoes aligned NW-SE, Chuo-Zao groups (Kaosan), Minami-Zao, Nishi-Zao (Ryuzan) and Kita-Zao groups (Ganto-yama and Kamuro-dake).

Topography of Zaosan - commonly divided into Minami Zao (south), Chuo Zao (center), Nishi Zao (west) and Kita Zao (north) - Map GSJ / N.Nakajima

Topography of Zaosan - commonly divided into Minami Zao (south), Chuo Zao (center), Nishi Zao (west) and Kita Zao (north) - Map GSJ / N.Nakajima

The Kaosan itself is a central volcanic complex, wearing several lava domes and a tuff cone, the Goshikidake.
The latter houses the active crater Okama / or Goryu-dake, filled with a green and acidic lake (pH 1.3), formed by an eruption in the 1720s, and source of most of the historical eruptions. Of 360 meters wide and 60 meters deep, it periodically changes of color, muddy deposits on its floor being disturbed by gas emissions ... which earned him the nickname of "five color pond".

The Zaosan, seen from the city of Sendai - photo GSJ / Ohba

The Zaosan, seen from the city of Sendai - photo GSJ / Ohba

Zaosan and Okama crater - photo H.Seo / Geological Survey of Japan / AIST

Zaosan and Okama crater - photo H.Seo / Geological Survey of Japan / AIST

 Zaosan: the Okama crater lake - aerial photo NeuroPower

Zaosan: the Okama crater lake - aerial photo NeuroPower

Besides the photogenic appearance of Okama Lake, the place is known for its winter "snow monsters".
Siberian winds on Lake flood with water droplets the surrounding trees, Aomori fir, and give them a monster appearance. These monsters are the delight of skiers and snow boarders that slip among them, despite the cold.
 

Monsters of Zao - photo Radika Sooknarine / Japan Travel

Monsters of Zao - photo Radika Sooknarine / Japan Travel

A bonus for volcanostamp lovers :

Warning on Zaosan / Japan.Warning on Zaosan / Japan.

Sources :

- JMA

- GSJ - Geological Survey of Japan - Zao Zan

- Global Volcanism Program - Zaozan

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