Crustal structure of the continental margin of Korea in the East Sea (Japan Sea) from deep seismic sounding data: evidence for rifting affected by the hotter than normal mantle SCIE SCOPUS

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Title
Crustal structure of the continental margin of Korea in the East Sea (Japan Sea) from deep seismic sounding data: evidence for rifting affected by the hotter than normal mantle
Author(s)
Kim, HJ; Jou, HT; Cho, HM; Bijwaard, H; Sato, T; Hong, JK; Yoo, HS; Baag, CE
Alternative Author(s)
김한준; 주형태; 홍종국; 유해수
Publication Year
2003-03-27
Abstract
Despite the various opening models of the southwestern part of the East Sea (Japan Sea) between the Korean Peninsula and the Japan Arc, the continental margin of the Korean Peninsula remains unknown in crustal structure. As a result, continental rifting and subsequent seafloor spreading processes to explain the opening of the East Sea have not been adequately addressed. We investigated crustal and sedimentary velocity structures across the Korean margin into the adjacent Ulleung Basin from multichannel seismic (MCS) reflection and ocean bottom seismometer (OBS) data. The Ulleung Basin shows crustal velocity structure typical of oceanic although its crustal thickness of about 10 km is greater than normal. The continental margin documents rapid transition from continental to oceanic crust, exhibiting a remarkable decrease in crustal thickness accompanied by shallowing of Moho over a distance of about 50 km. The crustal model of the margin is characterized by a high-velocity (up to 7.4 km/s) lower crustal (HVLC) layer that is thicker than 10 km under the slope base and pinches out seawards. The HVLC layer is interpreted as magmatic underplating emplaced during continental rifting in response to high upper mantle temperature. The acoustic basement of the slope base shows an igneous stratigraphy developed by massive volcanic eruption. These features suggest that the evolution of the Korean margin can be explained by the processes occurring at volcanic rifted margins. Global earthquake tomography supports our interpretation by defining the abnormally hot upper mantle across the Korean margin and in the Ulleung Basin. (C) 2003 Elsevier Science B.V. All rights reserved.
ISSN
0040-1951
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5527
DOI
10.1016/S0040-1951(03)00048-9
Bibliographic Citation
TECTONOPHYSICS, v.364, no.1-2, pp.25 - 42, 2003
Publisher
ELSEVIER SCIENCE BV
Subject
NONVOLCANIC RIFTED MARGIN; ULLEUNG BASIN; TRANSITION; TOMOGRAPHY; VELOCITIES; THICK; PLATE; MODE
Keywords
Korean margin; deep seismic sounding; tomography; crustal structure; magmatic underplating
Type
Article
Language
English
Document Type
Article
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