頁籤選單縮合
題 名 | Digital Elevation Model Offshore Taiwan and Its Tectonic Implications=臺灣海域數值地形模式及其在大地構造上之意義 |
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作 者 | 劉家瑄; 劉紹勇; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 9:4 1998.12[民87.12] |
頁 次 | 頁705-738 |
分類號 | 356.232 |
關鍵詞 | 臺灣海域; 數值地形; 大地構造; Digital elevation model; Swath bathymetry; Seafloor morphology; Morphotectonic structures; Taiwan offshore region; |
語 文 | 英文(English) |
英文摘要 | A new 500-m gridded digital bathymetric data set has been produced by compiling available shipboard bathymetric data supplemented by global bathymetric data sets in the area between 18°N and 27°N, and from 117°E to 125°E. Combined with topographic data from GTOPO30, a global land data set in 30 arc-second grid spacing, this new digital elevation model (DEM) reveals the regional as well as local morphology of Taiwan and its offshore area. Spatial resolution of 1 km is achieved in the area off eastern and southern Taiwan where swath bathymetric data are available. In other areas where ship tracks are sparse, a spatial resolution of 4 arc-minute is retained. This DEM provides the best topographic information at present on a regional scale, which helps to reveal many of the morphotectonic features related to the active tectonic processes of subduction and arc-continent collision in this region. Using 2-D shaded topographic maps and 3-D physiographic diagrams generated from the DEM, the major morphologic features in each tectonic province of the region are presented. The Taiwan Strait is characterized by low relief sea floor with two NE-SW trending depressions and a shallow bank in the center of the strait. Submarine canyons mark the continental slope. In the area off southern Taiwan, N-S trending ridges and troughs are the major morphological features, however, several NE-SW trending lineaments have been identified in the Luzon forearc region. Off eastern Taiwan, submarine canyons and topographic features related to sedimentary processes along the eastern flank of the Luzon Arc are revealed in detail. A prominent N-S trending linear ridge, the Gagna Ridge, located along 123°E on the West Philippine Basin floor is entering the Ryukyu Trench and has produced a big re-entrant at the frontal portion of the Yaeyama Ridge. E |
本系統中英文摘要資訊取自各篇刊載內容。