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We report here the discovery of two methane-enriched plumes in a water column above the Kumano Knoll ♯5 submarine mud volcano (KK#5) in Nankai Trough during 2004; a slight methane enrichment was observed in this region in 2000 and 2010. The deeper of the two plumes spread horizontally at depths near the top of KK#5, whereas a shallow plume spread at a height of 300m from the top of KK#5. The end-member...
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