2022
DOI: 10.1007/s11001-022-09495-9
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Visualization of shallow subseafloor fluid migration in a shallow gas hydrate field using high-resolution acoustic mapping and ground-truthing and their implications on the formation process: a case study of the Sakata Knoll on the eastern margin of the Sea of Japan

Abstract: Acoustic mapping enables an understanding of the surface distribution of shallow gas hydrate (GH) and related products. Acoustically characteristic materials such as fluid-seepage-related methane-derived authigenic carbonate and/or shallow GHs, may be widely distributed beneath the shallow seafloor of the Sakata Knoll. High-amplitude reflectors over the knoll are the top of gas-bearing permeable layers and connect to the reverse fault at the foot of the knoll. Shallow GH and bacterial mats were observed at the… Show more

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Cited by 6 publications
(8 citation statements)
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“…Given the obtained flow rate and average methane concentration (2.0 mM), the methane efflux rate was estimated to be 14 ± 3 mmol –1 m –2 d –1 , which is representative of a low flux methane seep . This low flux regime was supported by the lack of gas seeps on the seafloor as confirmed by the acoustic surveys . On the other hand, the methane concentrations were near zero (<0.005 mM) in the outside microbial mat and reference site sediments (Figure D,G).…”
Section: Resultsmentioning
confidence: 75%
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“…Given the obtained flow rate and average methane concentration (2.0 mM), the methane efflux rate was estimated to be 14 ± 3 mmol –1 m –2 d –1 , which is representative of a low flux methane seep . This low flux regime was supported by the lack of gas seeps on the seafloor as confirmed by the acoustic surveys . On the other hand, the methane concentrations were near zero (<0.005 mM) in the outside microbial mat and reference site sediments (Figure D,G).…”
Section: Resultsmentioning
confidence: 75%
“…7 This low flux regime was supported by the lack of gas seeps on the seafloor as confirmed by the acoustic surveys. 19 On the other hand, the methane concentrations were near zero (<0.005 mM) in the outside microbial mat and reference site sediments (Figure 1D,G).…”
Section: ■ Resultsmentioning
confidence: 90%
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