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Kudriavy, Russia

Russian Academy of Science, Anton Yakushev photos (fair use policy)

Kudriavy is a small volcano inside a large caldera on Iturup island, in the Kuril Archipelago north of Japan. One of the world's most remote locations, Kudriavy made news a few years ago when a unique deposit of rheniite, rhenium sulfide, was found around the steaming fumaroles at its top. The Kurils are, like the Aleutian chain farther around the Pacific rim, subduction-related volcanic arc islands.

The field of fumaroles is particularly hot, and this photo shows the extensive sulfur deposits around the steam vents. Russian researchers had to wear metallized, acid-resistant outerwear and beware of the wind direction to approach this deadly zone.

Anton Yakushev, the Russian scientist who discovered rheniite, said of his dangerous research, "Acid gases is a reason why I became blond during field work."

Arc Volcanism in a Nutshell

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