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題 名 | Morphological and Seismic Characteristics of the North Mien-Hua Submarine Canyon off Northeastern Taiwan=臺灣東北海域北棉花海底峽谷之形貌及震測特徵 |
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作 者 | 俞何興; 李明龍; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 9:2 1998.06[民87.06] |
頁 次 | 頁263-278 |
分類號 | 351.926 |
關鍵詞 | 臺灣; 東北海域; 北棉花海底峽谷; 形貌; 震測; Canyon; Morphology; Seismics; Taiwan; |
語 文 | 英文(English) |
英文摘要 | The North Mien-Hua Canyon on the East China Sea Slope off northeastern Taiwan is a multi-headed canyon. Four distinct heads immediately below the shelf edge coalesce to form a single canyon near the 900m isobath in the lower slope region. Morphologically, the North Mien-Hua Canyon can be divided into two distinct units: the upcanyon segment which is the fan-shaped sloping region extensively cut by these four tributary canyons, and the downcanyon section which is short and straight with no tributaries. These four tributary canyons are characterized by steep-sided V-shaped troughs with high reliefs in excess of 500m, suggesting intense down-cutting of the canyon. The single canyon couse on the lower slope still maintains a V-shape in cross- section but with a curved and irregular canyon bottom, implying partial sediment infilling. The seismic profiles show termination of parallel reflectors of slope sediments against the canyon walls and slumping features, providing evidence of downslope submarine excavation along the canyon course. Cut-and-fill features and only recognized in the downcanyon section. Morphological and seismic characteristics indicate that the upcanyon segment is dominated by erosion and the downcanyon section is represented by multiple episodes of canyon erosion and deposition. |
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