Dok Island" /> Won Kyun Kim" /> Won Kyun Kim, Chang Hwan Kim, Chan Hong Park, Hyun-Chul Han, Mun Sang Kown, Kyung Duck Min, Baek-Soo Kim and Young Sub Choi

" /> Won Kyun Kim, Chang Hwan Kim, Chan Hong Park, Hyun-Chul Han, Mun Sang Kown, Kyung Duck Min, Baek-Soo Kim and Young Sub Choi

. Econ. Environ. Geol. 2000;33:537-45. https://doi.org/">

Econ. Environ. Geol. 2000; 33(6): 537-545

Published online December 31, 2000

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Structural Implications of Gravity Anomalies around Dok Island and its Surrounding Seamounts in the East Sea

Won Kyun Kim*, Chang Hwan Kim*, Chan Hong Park*, Hyun-Chul Han**, Mun Sang Kown***, Kyung Duck Min****, Baek-Soo Kim***** and Young Sub Choi*****

*Marine Environment & Climate Change Lab., Korea ocean Research & Development Institute

**Petroleum & marine Resource Division, Korea Institute of Geology, Mining & materials

***Policy Research and Development Department, Korea Ocean Research & Development Institute

****Earth System Sciences, Yonsei University

*****Survey Division, National Oceanographic Research Institute

Received: October 13, 2000; Accepted: December 1, 2000

Abstract

<p class="바탕글">Shipborne gravity data are analyzed to investigate crustal structure under Dok-Island and its surrounding seamounts located in border of Ulleung Basin and Oki Bank in the East Sea. Relatively low free-air gravity anomaly compared with the volume of seamounts may be explainable by isostatic compensation. From 1st to 3rd Dokdo Seamounts, the decrease of free-air and Bouguer gravity anomalies implies the different degree of isostatic compensation, crustal thickness or/and density contrast. 3-D gravity modelling shows that seamounts have the mirror roots for regional Airy isostatic compensation, and from Ulleung Basin to Oki Bank, Moho discontinuity deepends and the density of crust is decreases. The results infer that study area is transitional zone from thin oceanic to thick continental crust. The depth of Moho discontinuity is about 15~16 km, which may be interpreted as an uplifting of Mantle to shallow depth comparing with other borders of the Ulleung Basin.

Keywords

Dok Island, seamount,isotatic compensation, Ulleung Basin, Oki Bank

Article

Econ. Environ. Geol. 2000; 33(6): 537-545

Published online December 31, 2000

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Structural Implications of Gravity Anomalies around Dok Island and its Surrounding Seamounts in the East Sea

Won Kyun Kim*, Chang Hwan Kim*, Chan Hong Park*, Hyun-Chul Han**, Mun Sang Kown***, Kyung Duck Min****, Baek-Soo Kim***** and Young Sub Choi*****

*Marine Environment & Climate Change Lab., Korea ocean Research & Development Institute

**Petroleum & marine Resource Division, Korea Institute of Geology, Mining & materials

***Policy Research and Development Department, Korea Ocean Research & Development Institute

****Earth System Sciences, Yonsei University

*****Survey Division, National Oceanographic Research Institute

Received: October 13, 2000; Accepted: December 1, 2000

Abstract

Shipborne gravity data are analyzed to investigate crustal structure under Dok-Island and its surrounding seamounts located in border of Ulleung Basin and Oki Bank in the East Sea. Relatively low free-air gravity anomaly compared with the volume of seamounts may be explainable by isostatic compensation. From 1st to 3rd Dokdo Seamounts, the decrease of free-air and Bouguer gravity anomalies implies the different degree of isostatic compensation, crustal thickness or/and density contrast. 3-D gravity modelling shows that seamounts have the mirror roots for regional Airy isostatic compensation, and from Ulleung Basin to Oki Bank, Moho discontinuity deepends and the density of crust is decreases. The results infer that study area is transitional zone from thin oceanic to thick continental crust. The depth of Moho discontinuity is about 15~16 km, which may be interpreted as an uplifting of Mantle to shallow depth comparing with other borders of the Ulleung Basin.

Keywords

Dok Island, seamount,isotatic compensation, Ulleung Basin, Oki Bank

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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