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題 名 | Velocity Structure Beneath the Eastern Offshore Region of Southern Taiwan Based on OBS Data=臺灣南部東側外海海底地震儀資料建立之速度構造 |
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作 者 | 陳讚煌; 中村吉雄; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 9:3 1998.09[民87.09] |
頁 次 | 頁409-424 |
分類號 | 351.945 |
關鍵詞 | 臺灣南部; 外海海底; 地震儀資料建立; Offshore Taiwan; OBS; Velocity model; |
語 文 | 英文(English) |
英文摘要 | Six ocean bottom seismographs (OBSs) were deployed along an eastwest seismic line at 22 ° 12'N latitude in the eastern offshore region of southern Taiwan to record air-gun shots over the instruments. The line extends from 122 ° 00'E in the Philippine Sea Basin to 120 ° 55'E near the Hengchun Peninsula and crossed the North Luzon Arc, the North Luzon Trough, the Huatung Ridge and the Southern Longitudinal Trough, from east to west. A seismic velocity model along the profile derived from the acquired data includes two layers of sediments with a P-wave velocity of less than 3.6 km/sec and upper and lower crusts with velocities of up to 5.3 km/s and 7.0 km/s, respectively. The sediment layer is very thin on the North Luzon Arc and Trough, but is as thick as 5 km under the Huatung Ridge and the Southern Longitudinal Trough. The crust, which is about 6 km thick under the Philippine Sea Basin, thickens westward and is more than 15 km under the North Luzon Arc and again towards the Hengchun Peninsula, with corresponding variations in Moho depth. The seismic structure in the area is thus consistent with a hypothesis that once a trench located along the Southern Longitudinal Trough might retreat farther west at a later stage. |
本系統中英文摘要資訊取自各篇刊載內容。