佐渡南西沖のマウンド・ポックマーク群下の三次元地震波速度構造 3D Seismic Velocity Structure below Mounds and Pockmarks in the Deep Water Southwest of the Sado Island

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 The METI (Ministry of Economics, Trade and Industry) Sado-oki Nansei 3D seismic survey was carried out in deep water southwest off Sado Island, Japan Sea. The survey area covered the Umitaka Spur, which features mounds and pockmarks. Other surveys sampled large masses of methane hydrate beneath the sea floor, discovered methane bubble plumes rising into the water, and investigated high resistivity anomalies below the sea floor.<br> We applied 3D pre-stack time migration and continuous velocity analysis method to 3D seismic data, and investigated the geological and P-wave velocity structure below the sea floor of the Umitaka Spur and its surrounding area.<br> This revealed high velocity anomalies, suggesting the methane hydrate occurrence below mounds and pockmarks. On the other hand, P-wave velocities below the sea floor in areas of the Umitaka Spur were lower than propagated in water layers. Therefore, it was suggested that concentrations of methane hydrates were limited below mounds and pockmarks, although some gas may be contained in low-velocity zones.<br> The situation may be caused by the localization of methane supplies from deep layers.

収録刊行物

  • 地學雜誌

    地學雜誌 118(1), 93-110, 2009-03-25

    公益社団法人 東京地学協会

参考文献:  13件中 1-13件 を表示

被引用文献:  8件中 1-8件 を表示

各種コード

  • NII論文ID(NAID)
    10030364863
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10232602
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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