Ocean and Polar Research

  • 제27권1호
  • /
  • Pages.35-44
  • /
  • 2005
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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서태평양에 위치한 해저산들의 3-D flexure 모델링 : 무한지판 모델

Three-dimensional Flexure Modeling by Seamount Loading in the Western Pacific: Infinite Plate Model

  • 이태국 (한국해양연구원 해저환경.자원연구본부) ;
  • 문재운 (한국해양연구원 해저환경.자원연구본부) ;
  • 지상범 (한국해양연구원 해저환경.자원연구본부) ;
  • 박정기 (한국해양연구원 해저환경.자원연구본부) ;
  • 이기화 (서울대학교 자연과학대학 지구환경과학부)
  • Lee, Tae-Gook (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Moon, Jai-Woon (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Chi, Sang-Bum (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Park, Cheong-Kee (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Lee, Kie-Hwa (School of Earth and Environmental Sciences, College of Natural Sciences Seoul National University)
  • 발행 : 2005.03.31
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초록

The bathymetric and gravity data were obtained in 2001 and 2003 during a survey of seamounts in the northwest of the Marshall Islands, western Pacific. The study areas are located in the Pigafetta Basin which is the oldest part of the Pacific plate and in the Ogasawara Fracture Zone which formed from the spreading ridge between the Izanagi and Pacific plates in the Jurassic. The densities of seamounts and the elastic thickness values of the lithosphere are calculated by using three-dimensional flexure modeling considering the constant sediment layer in the infinite plate model. Very low elastic thickness values (5km), relatively young seamounts, and old lithosphere in the east study area suggest the possibility of the rejuvenation of lithosphere by widespread volcanisms, whereas the elastic thickness values (15km), relatively old seamounts, and young lithosphere of the west study area are suitable for a simple cooling plate model of $300-600^{\circ}C$ isotherm. The gravity residuals of OSM6-1 and OSM6-2 suggest the possibility of different load density or elastic thickness. Relatively older OSM6-2 formed on the younger lithosphere with relatively thin elastic thickness, while younger OSM6-1 on the older lithosphere with relatively thick elastic thickness.

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