Present-day relative displacements between the Jeju Island and the Korean peninsula as seen from GPS observations

Abstract

We use three years data from six permanent GPS stations, in the Korean peninsula and Jeju Island, to examine the relative displacement between Jeju Island and the Korean peninsula and whether the Jeju Island lies on the Amurian Plate or not. Out of these stations, three sites, considered to be on the stable interior of the Amurian Plate (the Korean peninsula), showed relative velocities less than 1.3 mm/yr. On the other hand, the maximum velocity of the Jeju Island stations was 2.1 mm/yr with respect to DAEJ station, and the average relative velocity between the island stations and those in the main land are less than 1.7 mm/yr. By comparing these results with other velocities within the Amurian Plate, we found that the observed velocities are intra-plate. Our results are supported by geological evidences and seismological records, which claimed that the Korean peninsula and the Jeju Island are on the same plate. Hence, the Amurian Plate boundary line is considered to lie somewhere to the south of Jeju Island.

Composition and Evolution of Lithosphere Beneath the Jeju Island Region (I): A Review

“…제주도가 만들어지는 동 안에 여러 번의 빙하기가 있었으며, 빙하기에는 지금 보다 해수면이 130 m정도 낮아 여러 차례 육지와 연 결되었을 것이라는 해석도 있다 (Park, 2004). 현재 제 주도는 한반도 육지부와 마찬가지로 유라시아판에 위 치하며, 국부적인 판내부 열곡시스템 환경에 놓여 있 다 (Hamdy et al, 2004). 신생대 배호분지인 동해분지와 남쪽의 제주분지가 열리기 전(27-15 Ma)의 제주도는 한반도와 동일한 지 구조 환경에 놓여 있었으며, 백악기말-제3기초에 한 반도 남부지역과 동일한 섭입대 관련 칼크-알칼리 마 그마활동을 경험했다 (Sibuet et al, 1987;Lee et al, 1987;Kim et al, 2003).…”

Modern analogues for Miocene to Pleistocene alkali basaltic phreatomagmatic fields in the Pannonian Basin: “soft-substrate” to “combined” aquifer controlled phreatomagmatism in intraplate volcanic fields Research Article

“…Many more volcanic centres are buried or submerged. Jeju Island is surrounded by c. 100 metres-deep water [57] on the continental shelf of the Amurian Plate [58][59][60], which is the same plate as the rest of the Korean peninsula. An overall WSW-ENE compressional and NNW-SSE extensional regime exists in the southern part of the Korean peninsula [58][59][60], and this has been suggested for Jeju in order to explain volcanic centres alignments [61] however, such alignments are not as prominent as at PAVF.…”