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大黒海山

Daikoku

成層火山 · United States · 323m (海底)

A plume rises from a vent at about 400 m depth on Daikoku seamount in this close-up view only about a few meters across. During a NOAA expedition in 2006 scientists observed a convecting, black pool of liquid sulfur with a partly solidified, undulating sulfur crust. The summit of lies along an E-W-trending ridge SE of Eifuku submarine volcano and rises to within about 300 m of the ocean surface.
A plume rises from a vent at about 400 m depth on Daikoku seamount in this close-up view only about a few meters across. During a NOAA expedition in 2006 scientists observed a convecting, black pool of liquid sulfur with a partly solidified, undulating sulfur crust. The summit of lies along an E-W-trending ridge SE of Eifuku submarine volcano and rises to within about 300 m of the ocean surface. · 写真: Image courtesy of Submarine Ring of Fire 2006 Exploration, NOAA Vents Program. · Wikimedia Commons
タイプ
成層火山
国
United States
地域
Northwestern Pacific Volcanic Regions / Mariana Volcanic Arc
標高
323m (海底)
座標
21.324, 144.194
最終噴火
不明
テクトニクス環境
Subduction zone / Crustal thickness unknown
火山地形
Composite
主要岩石
Andesite / Basaltic Andesite
地質学的概要

The conical summit of Daikoku seamount lies along an E-W ridge SE of Eifuku and rises to within 323 m of the sea surface. A steep-walled, 50-m-wide crater on the N flank, about 75 m below the summit, is at least 135 m deep and was observed to emit cloudy hydrothermal fluid. During a NOAA expedition in 2006, scientists observed a convecting black pool of liquid sulfur with a partly solidified, undulating sulfur crust at a depth of 420 m below the summit. Gases, particulates with the appearance of smoke, and liquid sulfur were bubbling up from an edge of the sulfur pool.

Wikipedia の要約

英語版の要約

Daikoku Seamount is a submarine volcano located in the Northern Mariana Islands, in the western Pacific Ocean. It is situated on the Mariana volcanic arc. The seamount rises over 2,500 m (8,202 ft) meters from the seafloor, with its summit about 323 m (1,060 ft) below sea level. Since its discovery, the seamount has been studied by several expeditions, including expeditions made by NOAA, using various scientific tools, such as sonar mapping and remotely operated vehicles (ROVs). Daikoku Seamount hosts an active hydrothermal vent system that hosts diverse communities of deep-sea organisms, including tube worms, crabs, and snails. At the summit of the seamount, a crater filled with molten liquid sulfur called "Sulfur Cauldron" exists, which was discovered in 2006. In 2014, it was discovered in an expedition that the seamount had erupted, forming 2 new craters on the summit.

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