Measurements by Ocean Bottom Gravimeter at Harima-nada in Seto Inland Sea, Japan

• Joshima Masato

  National Institute of Advanced Industrial Science and Technology (AIST)

• Ishihara Takemi

  National Institute of Advanced Industrial Science and Technology (AIST)

• Koizumi Kin-ichiro

  Ocean Research Institute, University of Tokyo

• Seama Nobukazu

  Kobe University Research Center for Inland Seas

• Oshida Atsushi

  Kawasaki Geological Engineering Co., Ltd

• Fujimoto Hiromi

  Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University

• Kanazawa Toshihiko

  Earthquake Research Institute, University of Tokyo

Bibliographic Information

Other Title

• 瀬戸内海播磨灘での海底重力測定
• セトナイカイ ハリマナダ デ ノ カイテイ ジュウリョク ソクテイ

Abstract

Gravity measurements on the sea bottom using an ocean bottom gravimeter(OBG) and a small survey vessel of 8.5 tons were performed at Harima-nada, in the Seto Inland Sea, Japan. Measurements at one bottom station were completed in about 30 minutes including 2 mile transit from the previous station, and 23 new data were obtained during 4 days. The measurement noise on the shallow sea-bottom was reduced considerably by attaching an anchor to the rope between the deployed ocean bottom gravimeter and the ship, and by keeping the ship almost fixed to the deployed anchor. The measurement accuracy is better than 0.005 mgal at the base station and is better than 0.05 mgal for the sea bottom measurements with the anchor. The new measurements combined with old data revealed the presence of high gravity anomaly zone running in Harima-nada sub-parallel to the Median Tectonic Line.

Journal

• Journal of the Japan Society for Marine Surveys and Technology

  Journal of the Japan Society for Marine Surveys and Technology 18 (1), 1_17-1_27, 2006

  Japan Society for Marine Surveys and Technology

Details

• CRID: 1390282679314987648
• NII Article ID: 10021980708
• NII Article ID: 130004555903
• NII Book ID: AN10198626
• DOI: 10.11306/jsmst.18.1_17
• ISSN: 21854920
• ISSN: 09152997
• NDL BIB ID: 7923393
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7923393
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed