Browse > Article
http://dx.doi.org/10.5467/JKESS.2010.31.3.214

A Study on Geophysical Characteristics and Regional Geological Structures of the Southwestern Yellow Sea of Korea using Gravity and Magnetic Data  

Kim, Chang-Hwan (Dokdo Research Center, East Sea Research Institute, Korea Ocean Research and Development Institute)
Park, Chan-Hong (East Sea Research Institute, Korea Ocean Research and Development Institute)
Publication Information
Journal of the Korean earth science society / v.31, no.3, 2010 , pp. 214-224 More about this Journal
Abstract
Gravity and Magnetic survey data were analyzed to investigate the geophysical characteristics and regional geological structures of the southwestern Yellow Sea. The set of data about the southwestern part of the Yellow Sea in Korea was one collected by the Korea Ocean Research and Development Institute (KORDI) in 2003, 2004, and 2005. The Yellow Sea has a few basins and the study area also includes parts of the Heuksan Basin and the East China Sea Basin. The bathymetry of the study area ranges from about ?40 m southwestward near China to about 150 m northeastward near Korea. The bathymetry has the gentle rise and fall and the smooth slope. The gravity anomalies, from sea surface gravity and satellite gravity data, reflect the basement rocks rather than the smooth bathymetry. The gravity anomalies are higher on Northeastern part of the study area and lower over the South of the Heuksan Basin. The analytic signal from the Bouguer anomaly shows higher anomalous zones near the boundaries of the basins. The magnetic anomalies and the analytic signal, from the magnetic data, suggest that the complex anomalies on the Northern part are attributed to the volcanic intrusions and that the smooth patterns in the Southern part are based on the lack of the intrusions. The power spectrum analysis of the Bouguer anomalies and the magnetic anomalies indicate that the depth to the Moho discontinuity varies from about 30.2 to 28.3 km and that the depths of the basement rocks and the Eocene discontinuity range from about 8.4 to 8 km and from about 1.5 to 1.7 km, respectively. The inversion of the Bouguer anomaly shows that the Moho depth to the Western part of the study area near China is slightly deeper than the Eastern part near Korea. The result of 2-D gravity modeling has a good coherence with the results of the analytic signal, the power spectrum analysis, and the inversion.
Keywords
gravity; magnetic; analytic signal; power spectrum; inversion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Bassin, C., Laske, G., and Masters, G., 2000, The Current Limits of Resolution for Surface Wave Tomography in North America. EOS Transactions American Geophysical Union, 81, F897.
2 Hsu, S.K., Sibuet, J.C., and Shyu, C.T., 1996, High-resolution detection of geologic boundaries from potentialfield anomalies, An enhanced analytic signal technique.Geophysics, 61, 373-386.   DOI
3 Milliman, J.D. and Meade, R.H., 1983, World-wide delivery of river sediment to the oceans. Journal of Geology,100, 525-544.
4 Nabighian, M.N., 1972, The analytic signal of two-dimensional magnetic bodies with polygonal cross-section: Its properties and use for automated anomaly interpretation.Geophysics, 37, 507-517.   DOI
5 Nabighian, M.N., 1974, Additional comments on the analytic signal of two-dimensional magnetic bodies with polygonal cross-section. Geophysics, 39, 85-92.   DOI
6 Nabighian, M.N., 1984, Toward a three-dimensional automatic interpretation of potential-field data via generalized Hilbert transforms: Fundamental relations.Geophysics, 49, 780-786.   DOI
7 Roest, W.R., Verhoef, J., and Pillington, M., 1992, Magnetic interpretation using the 3-D analytic signal. Geophysics,57, 116-125.   DOI
8 Smith, W.H.F. and Sandwell, D.T., 1995, Marine gravity field from declassified Geosat and ERS-1 altimetry. Eos Transactions American Geophysical Union, 76, G42A-2.
9 Schubel, J.R. and Carter, H.H., 1984, The estuary as a filter for fine-grained suspended sediment. In Kennedy, V.S. (ed.), The Estuary as a Filter. Academic Press, NY, USA, 81-105.
10 Thurston, J.B. and Brown R.J., 1994, Automated sourceedge location with a new variable pass-band horizontalgradient operator. Geophysics, 59, 546-554.   DOI
11 공영세, 곽영훈, 김기석, 김승우, 김용환 외 25인, 1989, 대륙붕자원연구. 한국동력자원연구소, 402 p.
12 권영인, 박관순, 유강민, 손진담, 1995, 제주분지 제삼기 육성층의 층서 및 퇴적물 기원. 석유지질학회지, 3, 1-15.
13 유해수, 강길모, 강돈혁, 강성호, 강소라 외 109인, 2008, 배타적경제수역 해양광물자원조사. 한국해양연구원, 712p.
14 윤혜수, 이성숙, 이상헌, 김재호, 변현숙, 김기현, 박동배,1999, 제주분지 거북-1공과 옥돔-1공의 생층서 및 고환경. 고생물학회지, 15, 43-94.
15 전정수, 1995, 경상분지 남부지역(밀양소분지)의 지질구조에 관한 지구물리학적 연구. 연세대학교 지질학과 박사학위 논문, 139 p.
16 정태진, 손진담, 박관순, 김원식, 서상용 외 32인, 2001, 남해 대륙붕 석유자원 평가 연구. 한국지질자원연구원, 82p.
17 최승찬, 2005, CHAMP-GRACE 인공위성 데이터와 해상측정 중력 데이터에 나타난 황해안 지역의 남중국과 북중국판의 대륙 충돌대 위치. 대한지구물리학회지, 8,89-92.
18 허식, 최동림, 유해수, 민동주, 홍종국, 이광자, 2004, 남해제주분지 해역의 퇴적환경 및 지질구조 예비 해석. 지구물리, 7, 225-232.
19 Zhou, Z., Zhao, J., and Yin, P., 1989, Characteristics and tectonic evolution of the East China Sea. In Zhu, X. (ed.), Chinese Sedimentary Basins: Sedimentary Basins of the World 1. Elservier, Amsterdam, The Netherlands, USA, 165-179.