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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
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  • Journal title : Ocean and Polar Research
  • Volume 24, Issue 4,  2002, pp.491-500
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2002.24.4.491
 Title & Authors
A Study on the Structure and Origin of the Dokdo and it's Surroundings in the East Sea (Japan Sea) Using Magnetic Anomalies
Kim, Chang-Hwan; Park, Chan-Hong; Min, Kyung-Duck; Han, Hyun-Chul; Kwon, Moon-Sang; Shim, Jae-Seol; Choi, Sung-Ho; Oh, Soon-Bock;
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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.
magnetic data;Dokdo;diurnal correction;crossover correction;reduction-to-the-pole;second vertical derivative;analytic signal processing;subsidiary cone;crater;
 Cited by
중력 및 자력자료 분석에 의한 울릉분지 북동부 독도 및 주변 해산들의 형성 연구,김창환;박찬홍;고영탁;정의영;곽준영;유상훈;민경덕;

자원환경지질, 2007. vol.40. 2, pp.153-170
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