Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan
The westernmost Okinawa Trough back-arc basin is located to the north of the Ryukyu islands and is situated above the northward dipping Ryukyu subducted slab. In the northern continental margin of the Okinawa Trough, the continental slope between the Keelung Valley and the Mein-Hua Submarine Canyon...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2018-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Online Access: |
http://tao.cgu.org.tw/media/k2/attachments/v291p031.pdf
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| _version_ | 1811302563175202816 |
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| author | Ching-Hui Tsai Chi-Lo Huang Shu-Kun Hsu Wen-Bin Doo Shiao-Shan Lin Shiou-Ya Wang Jing-Yi Lin Chin-Wei Liang |
| author_facet | Ching-Hui Tsai Chi-Lo Huang Shu-Kun Hsu Wen-Bin Doo Shiao-Shan Lin Shiou-Ya Wang Jing-Yi Lin Chin-Wei Liang |
| author_sort | Ching-Hui Tsai |
| collection | DOAJ |
| description | The westernmost Okinawa Trough back-arc basin is located to the north of the Ryukyu islands and is situated above the northward dipping Ryukyu subducted slab. In the northern continental margin of the Okinawa Trough, the continental slope between the Keelung Valley and the Mein-Hua Submarine Canyon shows a steep angle and future slope failures are expected. The question is how slope failures will proceed? A sudden deep-seated slump or landslide would probably cause local tsunami and hit northern coast of Taiwan. To understand the probable submarine landslides, we conducted multi-channel seismic reflection, sub-bottom profilers, and multi-beam bathymetry surveys off NE Taiwan. Two general trends of shallow crustal faults are observed. The NE-SW trending faults generally follow the main structural trend of the Taiwan mountain belt. These faults are products of inversion tectonics of reverse faults from the former collisional thrust faults to post-collisional normal faults. Another trend of roughly E-W faults is consistent with the current N-S extension of the southern Okinawa Trough. The fault offsets in the eastern portion of the study area are more pronounced. No obvious basal surface of sliding is found beneath the continental margin. We conclude that the movement of the submarine landslides in the Keelung Shelf off northeastern Taiwan could be in a spread type. The submarine landslides mainly occur in the continental slope area and it is more obvious in the east than in the west of the Keelung Shelf. |
| first_indexed | 2024-04-13T07:30:15Z |
| format | Article |
| id | doaj.art-62a59b11dd0947399325af17b44c1ab2 |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-13T07:30:15Z |
| publishDate | 2018-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-62a59b11dd0947399325af17b44c1ab22022-12-22T02:56:22ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802018-01-01291313810.3319/TAO.2017.07.02.01Active normal faults and submarine landslides in the Keelung Shelf off NE TaiwanChing-Hui TsaiChi-Lo HuangShu-Kun HsuWen-Bin DooShiao-Shan LinShiou-Ya WangJing-Yi LinChin-Wei LiangThe westernmost Okinawa Trough back-arc basin is located to the north of the Ryukyu islands and is situated above the northward dipping Ryukyu subducted slab. In the northern continental margin of the Okinawa Trough, the continental slope between the Keelung Valley and the Mein-Hua Submarine Canyon shows a steep angle and future slope failures are expected. The question is how slope failures will proceed? A sudden deep-seated slump or landslide would probably cause local tsunami and hit northern coast of Taiwan. To understand the probable submarine landslides, we conducted multi-channel seismic reflection, sub-bottom profilers, and multi-beam bathymetry surveys off NE Taiwan. Two general trends of shallow crustal faults are observed. The NE-SW trending faults generally follow the main structural trend of the Taiwan mountain belt. These faults are products of inversion tectonics of reverse faults from the former collisional thrust faults to post-collisional normal faults. Another trend of roughly E-W faults is consistent with the current N-S extension of the southern Okinawa Trough. The fault offsets in the eastern portion of the study area are more pronounced. No obvious basal surface of sliding is found beneath the continental margin. We conclude that the movement of the submarine landslides in the Keelung Shelf off northeastern Taiwan could be in a spread type. The submarine landslides mainly occur in the continental slope area and it is more obvious in the east than in the west of the Keelung Shelf. http://tao.cgu.org.tw/media/k2/attachments/v291p031.pdf |
| spellingShingle | Ching-Hui Tsai Chi-Lo Huang Shu-Kun Hsu Wen-Bin Doo Shiao-Shan Lin Shiou-Ya Wang Jing-Yi Lin Chin-Wei Liang Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan Terrestrial, Atmospheric and Oceanic Sciences |
| title | Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan |
| title_full | Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan |
| title_fullStr | Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan |
| title_full_unstemmed | Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan |
| title_short | Active normal faults and submarine landslides in the Keelung Shelf off NE Taiwan |
| title_sort | active normal faults and submarine landslides in the keelung shelf off ne taiwan |
| url |
http://tao.cgu.org.tw/media/k2/attachments/v291p031.pdf
|
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