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| Titel |
Inter-bed fluid triggered slope failures of the Kaoping Canyon upstream area: Results from memorial R/V Ocean Researcher 5 |
| VerfasserIn |
Yi-Ching Yeh, Tsung-Fu Shen, Shao-Yung Liu, Pai-Sen Yu |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112730
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| Publikation (Nr.) |
 EGU/EGU2015-12903.pdf |
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| Zusammenfassung |
| As a major pathway of the sediment transportation, the submarine canyons sculpture the
seafloor then deposit sediments at the deep ocean. The submarine canyons could be classified
to two categories: erosive or deposition based on geological environment or fluid flow down
to the canyon. The erosive canyons often “attack” the levee which may result in
submarine landslides or mass transportations due to slope failure. Once slope failure
occurs at geological weakness area such as gas hydrate dissociation zone, giant mass
slumping will be triggered. These kinds of mass transportations will further develop
turbidity current or hyperpycnal flow, which could damage the submarine cables
or pipes. The giant mass transportation even triggers devastated tsunami. In this
study, a latest swath bathymetric map was compiled by comprising seven cruises
between December, 2012 and March 2013. The result shows that regressive erosion
may take a place north of 500 meters contour (gas hydrate dissociation region),
southwest off Taiwan. Moreover, high resolution seismic image (acquired by Edgetech
SB-424 sub-bottom profiler) show that gas rich sediments co-exist with submarine
landslide deposits in the edge of the upstream of Kaoping submarine canyon. It implies
that slope failures in the study area might be caused by weaken sediment collapse. |
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