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Geophysical characteristics of seamounts around Dok Island  

강무희 (한국지질자원연구원)
한현철 (한국지질자원연구원)
윤혜수 (충남대학교 지질학과)
이치원 (한국지질자원연구원)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.7, no.4, 2002 , pp. 267-285 More about this Journal
Abstract
Dok Island, a Pliocene volcano, lies in the southwestern part of the East Sea. Most the work to date have focused primarily on the petrolography of the island, and as a result, the morphological characteristics and internal structure of the volcanic edifices of the Dok Island remain poorly understood. To provide better constraints on these features, bathymetric data with multibeam echo sounder, 32-channel seismic and 3D gravity modeling were used in this study. Three positive topographic highs are present in the study area, and these highs satisfy the seamount criteria. They are named as Dokdo, Tamhae, and Donghae seamounts. 32-channel seismic survey was conducted to investigate the sediment thickness of the area, which shows that there are no sediments near the summit of seamounts. Away from the seamounts, however, sediment becomes thick(>2000 m) toward the western part of the study area, and sediments in the northern and southern parts are about 1000 m thick. Free-Air gravity anomalies in this study generally follow the bathymetric feature with less than -20 mGal at the western part, but increase towards the seamounts. In the summit of the Dokdo Seamount, anomalies reach over 120 mGal, and in Tamhae and Donghae seamounts, the peak anomaly shows 90 and 70 mGals, respectively. All seamounts have an isolated volcanic conduit in their centre and show regional compensation root with 0.5～1.5 km thickness. The flat-topped summit of the seamounts is probably caused by wave truncation, indicating the sea level at the time of formation of the flat-topped geometry. Comparison between the present-day sea level and subsidence level during the opening of the East Sea suggests that the seamounts in the study area have subsided by 200～300 m after the formation. Furthermore, it implies that the seamounts formed over 12～10 Ma.
Keywords
Dok Island; 3D gravity modeling; Seamounts; Volcanic conduit; Regional compensation; Flat-topped summit;
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  • Reference
1 Wedgeworth, B. and J. Kellogg, 1987. A 3-D gravity-tectonic study of Ita Mai Tai Guyot: An uncompensated seamount in the East Mariana Basin. In: Seamount, Islands, and Atolls, Geophys. Monogr. Ser., vol. 43, edited by Keating, B.H., P. Fryer, R. Batiza and G.W Boehlert, AGU, Washington, D.C., pp. 73-84
2 Batiza, R., D.J. Fomari, D.A Yanko, and P. Lonsdale, 1984. Craters, Calderas, and Hyaloclastites on Yong Pacific Seamount. J. Geophys. Res., 89: 8371-8390   DOI
3 Hess, H.H., 1946. Drowned ancient islands of the Pacific Basin, Am. J. Sci., 244: 772-791   DOI
4 Kennet, J.P., 1982. Marine Geology. Prentice-Hall, USA, 813 pp
5 Kim, Y.K., 1982. Petrology of alkali volcanic rocks in northern part of Ulleung Island. M.S. Thesis, Yonsei University, Seoul, 65 pp
6 Kim, Y.K., D.S. Lee and K.H. Lee, 1987. Fractional crystallization of the volcanic rocks from Dok Island, Korea. J. Geol. Soc. Korea, 23: 67-82
7 Kurashimo, E., M. Shinohara, K. Suyehiro, J. Kasahara and N. Hirata, 1996. Seismic evidence for stretched continental crust in the Japan Sea. Geophys. Res. Lett., 23: 3067-3070   DOI   ScienceOn
8 Le Pichon, X. and M. Talwani, 1964. Gravity survey of a seamount near $35{^\circ}$N $46{^\circ}$ W in the North Atlantic. Mar. Geol., 2: 262 -277   DOI   ScienceOn
9 Ludwig, WJ., S. Murauchi, R.E. Houtz, 1975. Sediments and structure of the Japan Sea. Geol. Soc. America Bull., 86: 651 -664   DOI
10 Plouff, D., 1976. Gravity and magnetic fields of polygonal prisms and applications to magnetic terrain corrections. Geophysics, 41:727-741   DOI
11 Sager, W.W., G.T. Davis, B.H. Keating and J.A. Philpotts, 1982. A geophysical and geologic history of Nagata seamount. J Geomagn. Geolectr., 34: 283-305   DOI
12 Schimke, G.R. and C. Bufe, 1968. Geophysical description of a Pacific Ocean seamount. J. Geophys. Res., 73: 559-569   DOI
13 Suh, M., M. Lee and B. Suk, 1993. Geological structure of the Ulleung Basin from marine gravity data. J Geol. Soc. Korea, 29: 119-127
14 Tamaki, K., K. Suyehiro, J. Allan, le. Ingle and K.A. Pisciotta, 1992. Tectonic synthesis and implications of Japan Sea ODP drilling. Proceedings OD?, Sci. Results, 127/123, Pt. 2: 1333-1348
15 Won, J.K. and M.W. Lee, 1984. The volcanism and petrology of alkali volcanic rocks, Ulleung Island. J Geol. Soc. Korea, 20: 296-305
16 Yoon, S.H., S.J. Park and S.K. Chough, 1997. Western boundary fault systems of Ulleung Back-arc Basin: further evidence of pull-apart opening. Geoscience J., 1: 75-88   DOI
17 Tamaki, K. and I.I. Bersenev, 1996. Morphology of the Japan Sea. In: Geology and Geophysics of the Japan Sea, edited by Isezaki, N., LL Bersenev, K. Tamaki, B.Y Karp and E.P. Lelikov, Terra Scientific Pub. Co., Tokyo, pp. 35-40
18 Le Pichon, X. and M. Talwani, 1965. Crustal structure of the midocean ridges; Seismic refraction measurement. J. Geophys. Res., 70: 319-339   DOI
19 유동근, 1999. 정밀 해저지형 탐사기술 자립화 연구. 한국자원연구소, 272 pp
20 Tamaki, K., 1988. Geological structure of the Japan Sea and its tectonic implications. Bull. Geol. Surv. Japan, 39: 269-365
21 Heiskanen, W.A and H. Moritz, 1987. Physical Geodesy. Instiute of Physical Geodesy, Austria, 364 pp
22 Sohn, Y.K., 1995. Geology of Tok Island, Korea: eruptive and depositional processes of a shoaling to emergent island volcano. Bull. Volcanol., 56: 660-674   DOI   ScienceOn
23 김원균, 김창환, 박찬홍, 한현철, 권문상, 민경덕, 김백수, 최영섭, 2000. 독도 및 그 주변 해산 중력 이상의 지구조적 해석. 자원환경지질학회지, 33: 537-545
24 Batiza, R., and D. Yanko, 1983. Volcanic development of small oceanic central volcanoes on the flanks of the East Pacific Rise inferred from narrow-beam echo-sounder surveys. Mar. Geol., 60: 53-90
25 Duxbury A.C. and AB. Duxbury, 1989. An introduction to the world's oceans. Brown Publishers, USA, 466 pp
26 Han, H.C., 1993. Geophysical constraints on the origin of the Shatsky Plateau. Ph.D. Dissertation, Texas A&M University, 272pp
27 석봉출, 1992 동해 울릉분지의 지구물리학적 연구. 한국해양연구소, BSPE 00242-433-5, 149 pp
28 Park, C.-H., H.-J. Kim, C.-S. Yang, B.-C. Suk and N. Isezaki, 1996. Crustal structure of the Ulleung Basin, the East Sea(Japan Sea), from gravity and ocean bottom seismometer data. J Geol. Soc. Korea, 32: 276-290
29 Park, K.S., 1992. Geologic structure and seismic stratigraphy of the southern part of Ulleung basin. In: Sedimentary basins in the Korean Peninsular and adjacent seas, edited by Chough, S.K., Hanlimwon Pub., Seoul, pp. 40-59
30 Sohn, Y.K. and K.H. Park, 1994. Geology and evolution of Tok Island, Korea. J Geol. Soc. Korea, 30: 242 -261
31 Jolivet, L. and K. Tamaki, 1992. Neogene kinematics in the Japan Sea region and volcanic activity of the northeast Japan arc. Proceedings ODP, Sci. Results, 127/128, Pt. 2: 1311-1331
32 한상준, 1996. 한국 대수심 해역의 지구적 해저환경 연구. 한국해양연구소, BSPN 00321-950-5, 548pp
33 Ingle, J.C., 1992. Subsidence of the Japan Sea: Stratigraphic evidence from ODP sites and onshore sections. Proceedings ODP, Sci. Results, 127/128, Pt. 2: 1197-1218
34 Menard, H.W, 1964. Marine Geology of the Pacific. McGraw-Hill, New York, 271 pp
35 Menard, H.W, 1984. Origin of Guyots: The Beagle to Seabeam. J. Geophys. Res., 89: 11117-11123   DOI
36 Freitag, H.C., 1987. Gravity fields of eight north Pacific seamounts: Implications for density. M.S. Thesis, Texas A&M University, 127 pp
37 Stroev, P.A. and H. Fujimoto, 1996. Gravity anomalies in and around the Japan Sea. In: Geology and Geophysics of the Japan Sea, edited by Isezaki, N., I.I. Bersenev, K. Tamaki, BY Karp and E.P. Lelikov, Terra Scientific Pub. Co., Tokyo, pp. 49-60
38 Jolivet, L., K. Tamaki and M. Fournier, 1994. Japan Sea, Opening history and mechanism: A synthesis. J. Geophys. Res., 99: 22237-22259   DOI
39 Kellogg, J.N., B.S. Wedgeworth and J. Freymuller, 1987. Isostatic compensation and conduit structures of western Pacific seamounts: Results of three-dimensional gravity modeling. In: Seamount, Islands, and Atolls, Geophys. Monogr. Ser., vol. 43, edited by Keating, B.H., P. Fryer, R. Batiza and G.W. Boehlert, pp. 85-96
40 Ingle, J.C., K. Suyehiro, M.T von Breymann et al., 1990. Introduction, background, and principal results of leg 128 of the Ocean Drilling Program, Japan Sea. Proceedings ODP, Init. Repts., 128:5-38
41 Natland J. H., 1976. Possible volcanologic explanations for the origin of flat-topped seamounts and ridges in the Line Islands and Mid Pacific Mountains. Initial Rep. Deep Sea Drill. Proj., 33: 779-787
42 Jordan, TH., H.W Menard, and D.K. Smith, 1983. Density and size distribution of seamounts in the Eastern Pacific inferred from Wide-Beam sounding data. J. Geophys. Res., 88: 10508-10518   DOI
43 Machida, H. and F. Arai, 1981. Late Quaternary large eruption recorded in distal areas around Japan. In: JAVCEI Symposium, pp. 214-215
44 Wedgeworth, B.S., 1985. Ita Mai Tai Guyot: A comparative geophysical study of western Pacific seamounts. M.S. Thesis, Hawaii University, 90 pp
45 Kim, H.J., C.H.Park, J.K. Hong, H.T. Jou, T.W. Chung, V. Zhigulef, and G.I. Anosov, 1994. A seismic experiment in the Ulleung Basin (Tsushima Basin), southwestern Japan Sea(East Sea of Korea). Geophys. Res. Lett., 21: 1975-1978   DOI   ScienceOn
46 Chough, S.K. and E. Barg, 1987. Tectonic history of Ulleung basin margin, East Sea(Sea of Japan). Geology, 15: 45-48
47 Kellogg, J.N. and I.J. Ogujiofor, 1985. Gravity field analysis of Sio Guyot: An isostatically compensated seamount in the Mid-PacificMounts. Geo-Marine Lett., 5: 91-97   DOI
48 Gnibidenko, H., 1979. The tectonics of the Japan Sea. Marine Geol., 32: 71-87   DOI   ScienceOn
49 Simkin, T., 1972. Origin of some flat-topped volcanoes and guyots. In: Studies in Earth and Space Sciences, Mem, 132, edited by Shagam R., et al., Geological Society ofAmerica, Boulder, Colo., pp. 183-194
50 Han, H.C., C.W. Lee, S.P. Kim, J.H. Kim, D.G. Yoo, K.O. Kim and M.H. Kang, 1998. Morphometric characteristics of seamounts around the Dok Island. In: J. Korean Soc. Oceanogr. Spring Session, Abstract, pp. 89-90
51 Tamaki, K., 1990. Bathymetric map of the Japan Sea. Proceedings ODP, Initial Reports, 128
52 Smith, D.K., 1988. Shape analysis of Pacific seamounts. Earth Planet. Sci. Lett., 90: 457 -466   DOI   ScienceOn