重力異常からみた東北日本沖日本海東縁部の堆積盆地構造

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書誌事項

タイトル別名
  • Subsurface Structure of the Southeastern Margin of the Japan Sea Inferred from Bouguer Gravity Anomalies
  • ジュウリョク イジョウ カラ ミタ トウホク ニホンオキ ニホンカイ トウエン
公開日
1996
DOI
  • 10.4294/zisin1948.49.3_403
公開者
公益社団法人 日本地震学会

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説明

A Bouguer gravity anomaly map was made for the study of subsurface structure in the southeastern part of Japan Sea, offshore Niigata to Aomori area. The gravity data were obtained during five R/V Hakurei-mare cruises, GH89-2, GH89-4, GH90, GH91, and GH92 by the Geological Survey of Japan. This area is characterized by many small ridges and troughs parallel to the Northeastern Japan arc. Geological studies suggested that these small ridges constituting the Sado Ridge, and the Dewa Bank Chain, were formed by the basin inversion of former extensional grabens. The three dimensional relief of the basement has been obtained from the Bouguer anomalies assuming two uniform layers with the density contrast 0.4g/cm3. The result clearly shows the structure by the basin inversion in the Sado Ridge. The basement underlain the Dewa Bank Chain is shallower than that of the Sado Ridge although it have been formed by basin inversion. The basement of the Okushiri Ridge shows different structure from basin inversion. The basement structures of the Dewa Bank Chain is estimated that the extensional grabens before the inversion was smaller than that of the Sado Ridge.

収録刊行物

  • 地震　第２輯

    地震　第２輯 49 (3), 403-416, 1996

    公益社団法人 日本地震学会

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