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Geological Significance of Liquefaction and Soft-sediment Deformation Structures
액상화와 연질퇴적변형구조의 지질학적 의미
Econ. Environ. Geol. 2019 Oct;52(5):471-84
Published online October 31, 2019;  https://doi.org/10.9719/EEG.2019.52.5.471
Copyright © 2019 the Korean society of economic and environmental gelology.

Yong Sik Ghim1,2 and Kyoungtae Ko1*
김용식1,2 · 고경태1*

1Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2School of Earth System Science, Kyungpook National University, Daegu 41566, Korea
1한국지질자원연구원 국토지질연구본부, 2경북대학교 지구시스템과학부
Received September 17, 2019; Revised October 10, 2019; Accepted October 10, 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
Liquefaction occurs by a temporal loss of sediment strength as a consequence of increased pore water pressure during the re-arrangement of unconsolidated, granular sediments. Liquefaction is dependent on the physical properties of the sediments and cause surface cracks, landslide, and the formation of soft-sediment deformation structures(SSDS). SSDS is formed by the combined action of the driving force and deformation mechanism(liquefaction, thixotropy, and fluidization) that is triggered by endogenic or exogenic triggers. So research on the SSDS can unravel syndepositional geological events. If detailed sedimentologic analysis together with surrounding geological context suggest SSDS formed by earthquakes, the SSDS provide a clue to unravel syndepositional tectonic activities and detailed paleoseismological information(> Mw 5) including earthquakes that leave no surface expression.
Keywords : Liquefaction, soft-sediment deformation structures, fluidization, earthquake, paleoseismology

 

December 2019, 52 (6)