지구물리자료를 이용한 독도 주변의 지구조 해석

DC Field Value Language
dc.contributor.author 김창환 -
dc.contributor.author 정의영 -
dc.contributor.author 박찬홍 -
dc.contributor.author 권병두 -
dc.contributor.author 박계순 -
dc.contributor.author 박준석 -
dc.date.accessioned 2020-07-16T23:50:38Z -
dc.date.available 2020-07-16T23:50:38Z -
dc.date.created 2020-02-11 -
dc.date.issued 2008-12-15 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/29645 -
dc.description.abstract The northeastern part of the Ulleung Basin in the East Sea is composed of volcanic islands (Ulleungdo and Dokdo), seamounts (the Anyongbok Seamount, the Simheungtaek and the Isabu Tablemounts), and a deep pathway (Korea Gap). To understand tectonic structure and geophysical characteristics of Dokdo and adjacent area, We analysed geophysical potential data of KORDI(Korea Ocean Research and Development Institute), KIGAM(Korea Institute of Geoscience and Mineral Resources), and NORI(National Oceanographic Research Institute of Korea) around the Dokdo volcanic body except Ulleung Do because of empty data of its large island. Also, we eliminate the effect of water and sediments from the free-air gravity data to process 3D Moho depth inversion. 3D tectonic structure modelling of the study area was developed using Moho depth inversion result and sediment thickness data of NGDC(National Geophysical Data Center). The free-air gravity anomalies of the study area generally reflect bathymetric effects. Although the Dokdo seamounts have a similar topographic size, the decrease of free-air anomaly toward Isabu suggest that Isabu is oldest among the seaounts and have high degree of isostatic compensation. High Bouguer anomalies in the central part of the Ulleung Basin gradually decreases toward the Oki Bank. This feature suggests that the crust/mantle boundary is shallow in the central part of the Ulleung Basin. The complex magnetic pattern of Dokdo suggests that it might have erupted several times during its formation. The magnetic anomaly amplitude of Isabu is much smaller than that of Dokdo. Such low magnetic anomalies are attributed to a secondary change caused by the metamorphism or weathering of ferromagnetic minerals of the seamount during a long period of time after its formation. Analytic signals show high anomalous zones over volcanoes. Also, there are high analytic signal values in Korea Gap indicating magmatic intrusion in thick sediments. The power spectrum analysis o -
dc.description.uri 1 -
dc.language English -
dc.publisher Amarican Geophysical Union -
dc.relation.isPartOf 2008 AGU fall meeting -
dc.title 지구물리자료를 이용한 독도 주변의 지구조 해석 -
dc.title.alternative Tectonic structure of Dokdo and adjacent area in the northeastern part of the Ulleung Basin of the East Sea using geophysical data -
dc.type Conference -
dc.citation.conferencePlace US -
dc.citation.endPage 1 -
dc.citation.startPage 1 -
dc.citation.title 2008 AGU fall meeting -
dc.contributor.alternativeName 김창환 -
dc.contributor.alternativeName 정의영 -
dc.contributor.alternativeName 박찬홍 -
dc.identifier.bibliographicCitation 2008 AGU fall meeting, pp.1 -
dc.description.journalClass 1 -
Appears in Collections:
East Sea Research Institute > Dokdo Research Center > 2. Conference Papers
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