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題名 | The Images of Subduction Slabs in the Taiwan Region=臺灣地區隱沒帶速度影像 |
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作者 | 馬國鳳; 劉乃菁; | 書刊名 | 中國地質學會會刊 |
卷期 | 40:4 1997.10[民86.10] |
頁次 | 頁653-670 |
分類號 | 351.925 |
關鍵詞 | 三維速度構造; 5%速度高區; 隱沒帶; Three-dimensional tomographic inversion; 5%high velocity zones; Surroundings; |
語文 | 英文(English) |
中文摘要 | 本研究利用中央氣象局的高品質地震資料來反演臺灣地區的三維速度構造,以了 解臺灣地區隱沒帶的形貌及其與附近地體構造的關係。研究中得出兩相對於周圍速度 5% 的 速度高區,此二速度高區分別與菲律賓海板塊向北隱沒的隱沒帶及臺灣東南的隱沒帶有關。 由沿著東經 121.5 °的速度剖面, 得出菲律賓海板塊在緯度 24 °深度約 40 公里時開始 隱沒,且在緯度 25 °時到達深度 80 公里。由許多影像速度剖面圖得知歐亞大陸板塊在東 經 120.8 °深度 40 公里時開始隱沒。 在北緯 22.9 °以南及北緯 23.5 °以北,臺灣的 地體活動主要與此二隱沒帶有關;但在其間主要是由菲律賓海板塊與歐亞大陸板塊的撞擊有 關。 |
英文摘要 | A three-dimensional tomographic inversion using high quality data recorded by the Central Weather Bureau Seismographic Network (CWBSN) was conducted to obtain clear and reliable images in the regions corresponding to the subduction slabs and to understand the tectonic environment of the Taiwan region. High velocity zones with a veolcity perturbation of about 5% relative to the surroundings are found. These zones correspond to the subduction Philippine Sea Plate in northern Taiwan and to that in southeastern Taiwan. The image profile along the longitude of 121.5°E shows that the Philippine Sea Plate starts subducting at the latitude of 24°N at the depth of about 40 km and extends to the depth of 80 km at the latitude of 25°N. Several image profiles along various latitudes show that the Eurasian Plate starts to subducts at longitude 120.8°E at a depth of 40 km. The teconic activity to the south of 22.9°N and to the north of 23.5°N is mainly dominated by the subducting slabs, while within the range, it is mainly dominated by the active collision of the two plates. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。