Crustal analysis of the Ulleung Basin in the East Sea (Japan Sea) from enhanced gravity mapping SCIE SCOPUS

Cited 8 time in WEB OF SCIENCE Cited 8 time in Scopus
Title
Crustal analysis of the Ulleung Basin in the East Sea (Japan Sea) from enhanced gravity mapping
Author(s)
Park, Chan Hong; Kim, Jeong Woo; Isezaki, Nobuhiro; Roman, Daniel R.; von Frese, Ralph R. B.
Publication Year
2006
Abstract
To facilitate geological analyses of the Ulleung Basin in the East Sea (Japan Sea) between Korea and Japan, shipborne and satellite altimetry-derived gravity data are combined to derive a regionally coherent anomaly field. The 2-min gridded satellite altimetry-based gravity predicted by Sandwell and Smith [Sandwell DT, Smith WHF (1997) J Geophys Res 102(B5):10,039-10,054] are used for making cross-over adjustments that reduce the errors between track segments and at the cross-over points of shipborne gravity profiles. Relative to the regionally more homogeneous satellite gravity anomalies, the longer wavelength components of the shipborne anomalies are significantly improved with minimal distortion of their shorter wavelength components. The resulting free-air gravity anomaly map yields a more coherent integration of short and long wavelength anomalies compared to that obtained from either the shipborne or satellite data sets separately. The derived free-air anomalies range over about 140 mGals or more in amplitude and regionally correspond with bathymetric undulations in the Ulleung Basin. The gravity lows and highs along the basin's margin indicate the transition from continental to oceanic crust. However, in the northeastern and central Ulleung Basin, the negative regional correlation between the central gravity high and bathymetric low suggests the presence of shallow denser mantle beneath thinned oceanic crust. A series of gravity highs mark seamounts or volcanic terranes from the Korean Plateau to Oki Island. Gravity modeling suggests underplating by mafic igneous rocks of the northwestern margin of the Ulleung Basin and the transition between continental and oceanic crust. The crust of the central Ulleung Basin is about a 14-15 km thick with a 4-5 km thick sediment cover. It may also include a relatively weakly developed buried fossil spreading ridge with approximately 2 km of relief.
ISSN
0025-3235
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4970
DOI
10.1007/s11001-006-9006-1
Bibliographic Citation
MARINE GEOPHYSICAL RESEARCH, v.27, no.4, pp.253 - 266, 2006
Publisher
SPRINGER
Subject
TSUSHIMA BASIN; OPENING MODE; ARC; ROTATION
Keywords
shipborne and satellite gravity; cross-over adjustment; Ulleung Basin; gravity modeling; transitional crust; fossil ridge
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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