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Review on Marine Terraces of the East Sea Coast, South Korea : Gangreung – Busan
강릉-부산 간 동해안 해안단구 검토
Econ. Environ. Geol. 2019 Oct;52(5):409-25
Published online October 31, 2019;  https://doi.org/10.9719/EEG.2019.52.5.409
Copyright © 2019 the Korean society of economic and environmental gelology.

Sung-Ja Choi*
최성자*

Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea
한국지질자원연구원 국토지질연구본부
Received September 5, 2019; Revised October 15, 2019; Accepted October 16, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Marine terraces, a step-like landform, are important geologic markers that provide tectonic information during the Quaternary Period. Marine terraces are well developed along all coastlines(East, West, and South) of the Korean Peninsula, those along the East coastline are the most distinctive. The marine terraces of the East coastline are classified into 4-6 flights that are several meters or several tens of meters above the present sea level. It is believed that these terraces, except for the lowest one, were formed in the middle Pleistocene. In the base of the OSL age dating results and Blake excursion events of magnetostratigraphy, the 2nd and 3rd terraces are correlated to the last interglacial stage. Considering the marine terraces linked to a sea-level curve of the Pleistocene, it is thought that regional tectonic movements have uplifted the East coastal area since the middle Pleistocene. Besides, former shorelines of each terrace have varied elevations from Gangreung to Busan bay, which can be divided into four regions, namely, Gangreung-Yonghanri(I), Homikot-Najung(II), Najung-Bangeojin(III), and Waesung-Busan Bay(IV). The former shorelines of each terrace at both Gangreung-Yonghanri(I) and Najung-Bangeojin(III) are higher than those in the other two regions, due to block movements by regional faults such as the Ocheon Fault or its subsidiaries, the Gampo Lineament and Ulsan Fault. Uplift rate of the East coast ranges from 0.2 m/ky to 0.3 m/ky, but each region shows different uplift rate.
Keywords : marine terraces, former shorelines, last interglacial stage, block movements, 0.2m/ky to 0.3m/ky

 

December 2019, 52 (6)