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The collision between Eurasian and Pacific plates along the eastern margin of the Asian continent resulted in formation of a series of island-arcs, one of which is the Taiwan Island-arc, and the Taiwan Straits is a foreland basin in the continent-arc collision zone. The Quaternary fine-grained sediments occur evenly in the upper part of the basin, and the Pliocene deposits in the lower part. The stepped faults run in the deposits, indicating that the tectonic movement tended to weaken after the Pliocene. Strong seismic zones of Taiwan Island released large amount of plate overthrust-collision compressive stress and have their screen and prevention roles for the straits. Only the intersections between offshore NW-trending transform-like faults and seashore NE-trending faults on the southern and northern terminations of the Island are prone to strong earthquakes. The possibility of occurrence of M ≥ 6 earthquake should be very low in the area for the planned future tunnel. Moreover, the seismic intensity is rapidly attenuated from the surface downward. Thus, the seismic intensity for the tunnel under the seabed will be much lower. In seismotectonic view, the construction of tunnel is feasible. 相似文献
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文中参照各家关于台湾海峡及邻区的地质构造和演化的观点,依据作者的野外考察和室内研究成果,列举了一些鲜为人知的事实和困难,以澄清海峡两岸的构造联系和差异,肯定了浙闽结晶基底属于古亚洲大陆并发育为加里东地槽,而台湾结晶基底与板块俯冲密切相关。上覆岩系反映了地壳运动所导致的海侵、海退旋回,中生代的火山活动和板块碰撞。该区的北东向断裂愈临近太平洋板块活动强度愈大,时代较新的北西向断裂在海峡两岸均有走滑压性特征。文中详述了在基底构造、上覆岩系、断裂系统方面需要深化的认识。 相似文献
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Boqian Xu Funan Yu Shugarov A. S. Sachkov M. E. Savanov I. S. Yan Gao Shuaihui Wang Guohao Ju Chunyue Zhang Ye Kuang 《Solar System Research》2020,54(7):685-689
Solar System Research - Astronomical space telescopes with large apertures of various spectral ranges have become one of the main tools of exploring the Universe. Conventional technologies do not... 相似文献
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This article discusses briefly the major features of topography, geology, and crustal stability of the possible Taiwan Strait Tunnel Project (TST Project) area. Any one route of the conceived TST Project is larger than either of the English Channel Tunnel or the Seikan submarine Tunnel (Japan) by at least three times in length, and the topographic and geologic conditions are rather more complex and complicated than those of the former two projects. Moreover, the Taiwan Strait is a seismic risk area. Hence, the selection of the route of the submarine tunnel should take advantage of the favorable conditions in the topographic, geologic, seismologic, and other fields to avoid the unfavorable circumstances. At the end of the article, two supposed by comparable routes, especially the south one of TST Project are discussed. 相似文献
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