동해 남서 울릉분지에서의 제 4기 후기(<29.4 cal kyr BP) 해저사면사태의 발생 및 특성 변화

Title
동해 남서 울릉분지에서의 제 4기 후기(<29.4 cal kyr BP) 해저사면사태의 발생 및 특성 변화
Alternative Title
Changes in characters and occurrences of the latest Quaternary (<29.4 cal kyr BP) slope failures in SW Ulleung Basin, East Sea (Japan Sea)
Author(s)
이상훈; 김한준; 박장준; 이경은; 주형태; 석봉출
KIOST Author(s)
Lee, Sang Hoon(이상훈)Jou, Hyeong Tae(주형태)
Alternative Author(s)
이상훈; 김한준; 주형태; 석봉출
Publication Year
2009-04-22
Abstract
Detailed analysis of depositional characters and ages of turbidites from the southwestern Ulleung Basin reveals changes in frequency, failing area and dimension of slope failures after 29.4 cal kyr BP. Abundant thin- to thick-bedded turbidites between 29.4 and 19.1 cal kyr BP indicate that various-scale slope failures occurred frequently during the last glacial period. When sea level was lowest (20.0-19.1 cal kyr BP), larger-scale slope failures occurred, forming very thick turbidites. Occurrence and thickness of turbidites decreased after 19.1 cal kyr BP when sea level began to rise, reflecting decrease in frequency and dimension of slope failures. The upward change from muddy to sandy turbidites around 21.4 cal kyr BP indicates that failing areas retrograded upslope from the upper-middle muddy slope to the uppermost sandy slope when sea level was nearly lowest. In the southwestern slope of the basin, frequent slope failures during the last glacial period suggest that slope failures were mostly triggered by earthqukes associated with active decomposition of gas hydrate during sea-level lowering.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29571
Bibliographic Citation
2009년 춘계지질과학기술 공동학술대회, pp.201, 2009
Publisher
대한자원환경지질학회, 대한지질학회, 한국석유지질학회
Type
Conference
Language
English
Publisher
대한자원환경지질학회, 대한지질학회, 한국석유지질학회
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