Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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A Study on the Structure and Origin of the Dokdo and it's Surroundings in the East Sea (Japan Sea) Using Magnetic Anomalies

지자기이상을 이용한 동해 독도 및 독도주변의 구조와 성인에 관한 고찰

  • 김창환 (한국해양연구원 지구환경연구본부) ;
  • 박찬홍 (한국해양연구원 지구환경연구본부) ;
  • 민경덕 (연세대학교 지구시스템과학과) ;
  • 한현철 (한국지질자원연구원 석유해저자원연구부) ;
  • 권문상 (한국해양연구원 연구정책실) ;
  • 심재설 (한국해양연구원 연안.항만공학연구본부) ;
  • 최성호 (국립해양조사원 측량과) ;
  • 오순복 (국립해양조사원 측량과)
  • Published : 2002.12.31
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Abstract

Magnetic anomalies in the Dokdo and it's surroundings were investigated with respect to structure and origin of the Dokdo and surrounding seamounts. After normal and diurnal correction of measured magnetic data, crossover correction was applied to reduce errors between sets of magnetic anomalies. The errors from crossover operation result in decrease of about 51%, from 62.2 nT to 30.1 nT in standard deviation. Reduction-to-the-pole, second vertical derivative and analytic signal processing were applied to explore magnetic anomaly signatures in detail. Magnetic anomalies are most complicated in the 1st-Dok seamount, show SWW-NEE linear pattern in the 2nd-Dok seamount and lower to the 3rd-Dok seamount. Different magnetic anomaly patterns in three seamounts imply that three volcanic seamounts were formed at different times and are composed of rocks that were produced in different conditions. It seems that the 3rd-Dok seamount was first to form and followed by the 1st-Dok seamount. The complicated magnetic and second vertical derivative anomaly patterns in the 1st-Dok seamount may be due to subsidiary cones around crater or the presence of intruded magma bodies below sea surface and the Dokdo is probably a marginal subsidiary part of crater.

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References

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