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Daikoku
"The conical summit of Daikoku seamount lies along an elongated E-W-trending ridge SE of Eifuku submarine volcano and rises to within 323 m of the sea surface. Daikoku submarine volcano is one of about a dozen displaying hydrothermal activity in the southern part of the Izu-Marianas chain. A steep-walled, 50-m-wide cylindrical crater on the north 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 of Daikoku. Gases, particulate with the appearance of smoke, and liquid sulfur were bubbling up from the back edge of the sulfur pool."  -Smithsonian Volcano Archive
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