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題名 | Westward Extension of the Okinawa Trough at Its Western End in the Northern Taiwan Area: Bathymetric and Seismological Evidence=沖繩海槽在臺灣北部地區之向西延伸:地形和地震證據 |
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作者 | 王正松; 楊敏郎; 周治平; 張逸中; 李昭興; Wang, Chengsung; Yang, Min-lang; Chou, Chi-ping; Chang, Yet-chung; Lee, Chao-shing; |
期刊 | Terrestrial, Atmospheric and Oceanic Sciences |
出版日期 | 20000600 |
卷期 | 11:2 2000.06[民89.06] |
頁次 | 頁459-480 |
分類號 | 351.925 |
語文 | eng |
關鍵詞 | 沖繩; 海槽; 地形; 地震; Development of the Okinawa trough; Detailed bathymetry; |
英文摘要 | In this paper, we used detailed bathymetry, earthquake distributionand focal mechanisms to study the phenomenon of active westward extension of the Okinawa trough in the northern Taiwan area. We found a distinguishable subsiding and collapsing area on the continental shelf edgeand the continental slope on the northern side of the Okinawa trough. Thisarea extends westwards to at least 121.5-E and includes several morphological units related to the existence and formation of three major canyons.The canyons and the morphological units are still evolving through the sediment transport and through the subsidence and collapse of material due tothe formation of the Okinawa trough. According to the degree of development, we found that these morphological units have developed from theeast to the west. There are two parallel E-W trending central graben at thewesternmost part of the Okinawa trough, with each corresponding to anarrow shallow seismic belt. The widths of the central graben are 10-15km. There is geophysical and geological evidence that the formation of thesecentral graben has been extended westwards to the onland area of Taiwan.Focal mechanisms of earthquakes and the topographic features show thatthe formation of the Okinawa trough is associated with the down-dip extensional stress along the subducting slab of the Philippine Sea plate, andmost of northern Taiwan and all the northeastern offshore area of Taiwanare under tensional stress. New portions of the Okinawa trough have beenforming across the whole width at its western end through subsidence inthe continental shelf, the continental slope and the traditionally recognizedarea of the Okinawa trough in the northeastern Taiwan area, to make theOkinawa trough develop gradually and extend westwards. |
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