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排序方式: 共有573条查询结果,搜索用时 62 毫秒
61.
冬季青藏高原对东移大槽动力影响的研究:Ⅲ.模拟试验结果的分析 总被引:3,自引:3,他引:3
具体分析了本文Ⅱ的模拟试验结果。结果表明,该试验较清楚地再现了青藏高原地形对西风气流的影响,也显示了不同地形、急流的有无、强度和位置以及初始槽强度和基本气流斜压性的强度对东移槽的影响。这些结果有的清楚地再现了过去熟知的或还不很清楚的地形影响事实,有的可为东移槽的预报提供着眼点。 相似文献
62.
Abstract The Nankai Trough, off southwest Japan, is one of the best sites for the study of geomorphic characteristics of a clastic accretionary prism. A recent multibeam survey over the central and eastern parts of the Nankai accretionary prism has revealed a large variation of the topography along the trough axis. Analysis of the bathymetric data suggests the existence of prism deformational features of different scales, such as depressions, embayment structures and cusps. These structures are the results of slope instability caused by basement relief of subducted oceanic plate. Unstable slopes recover by new accretion and development of a low angle thrust. Small-scale deformation due to the subduction of a small isolated seamount is then adjusted to the regional trend. By contrast, a 30 km indentation of the wedge observed in the eastern part of the Nankai Trough, the Tenryu Cusp, has seemed to retain its geometry. The subducted Philippine Sea plate has deformed greatly near the eastern end of the Nankai Trough, because of the collision between the Izu-Ogasawara (Bonin) arc and central Japan. Therefore, the indentation may be the result of the continuous subduction of a basement high, such as the Zenisu Ridge, which has been formed under north-south compression due to the arc-arc collision. 相似文献
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64.
Tsunami deposits provide a basis for reconstructing Holocene histories of great earthquakes and tsunamis on the Pacific Coast
of southwest Japan. The deposits have been found in the past 15 years at lakes, lagoons, outcrops, and archaeological excavations.
The inferred tsunami histories span 3000 years for the Nankai and Suruga Troughs and nearly 10,000 years for the Sagami Trough.
The inferred histories contain recurrence intervals of variable length. The shortest of these —100–200 years for the Nankai
Trough, 150–300 years for the Sagami Trough — resemble those known from written history of the past 1000–1500 years. Longer
intervals inferred from the tsunami deposits probably reflect variability in rupture mode, incompleteness of geologic records,
and insufficient research.
The region's tsunami history could be clarified by improving the geologic distinction between tsunami and storm, dating the
inferred tsunamis more accurately and precisely, and using the deposits to help quantify the source areas and sizes of the
parent earthquakes. 相似文献
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日本南海海槽天然气水合物研究现状 总被引:8,自引:3,他引:8
本文介绍日本在其周围海域特别是南海海槽的海洋天然气水合物研究工作,首先介绍其研究简史,研究计划,研究队伍及早期研究成果,其次,介绍了西南海海槽天然气水合物的勘探、研究状况,然后,介绍了五年计划实施的东南海海槽地球物理勘探、钻探状况,最后指出,南海海槽的一些新资料深入的综合研究无疑会给世界水合物研究增添新的内容。 相似文献
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69.
Structure and evolution of the backstop in the eastern Nankai Trough area (Japan): Implications for the soon-to-come Tokai earthquake 总被引:1,自引:0,他引:1
Abstract We present data showing that the intra-oceanic shortening now occurring south of the eastern Nankai Trough that has produced the Zenisu Ridge has also been responsible for the formation of a previous ridge now buried below the continental margin. This ridge, that we refer to as Paleo-Zenisu, is presently adjacent to the backstop and its location coincides with the outer limit of the seismogenic decollement. The subduction of the paleo-Zenisu ridge below the wedge has led to its complete reorganization and has given its identity to the Great Tokai earthquake rupture zone. The formation of paleo-Zenisu and its consequent subduction has induced the tilting of the backstop toward the northwest since ca 2 Ma. This model suggests that the backstop and possibly the wedge are dextrally sheared because they are extruded southwestward in relation to the collision of the Izu-Bonin Ridge with Japan. We use the finite motion from Zenisu to paleo-Zenisu to derive both the subduction vectors along the Nankai Trough and the shortening vectors within Zenisu-Izu. The amount of shortening absorbed within Zenisu-Izu increases toward the northeast. The corresponding subduction vectors of the Zenisu platelet below the wedge decrease accordingly to the northeast from 50 to less than 20 mm/year and the Zenisu body rotates clockwise with a pole near 36° North, 139° East. This might explain the apparent longer repetition time of great earthquakes in the Tokai area. On the other hand, the 25-35 mm/year obtained for the rate of shortening along the Zenisu thrust indicates a high seismic potential there. 相似文献
70.
准噶尔地块为前震旦纪地块。古生代,本区进一步演化成为一个由大陆裂谷发育起来的不成熟洋壳——准噶尔海槽。该海槽向西可与苏联巴尔喀什相通,并将哈萨克斯坦古板块肢解为南、北两大陆块。早石炭世末,本区结束了洋壳历史,重新成为大陆克拉通,托里北——达拉布特一线为缝合线位置。中石炭世以后,以碰撞后构造为主导,发生过三次明显的块断运动和A型俯冲。北东向的达拉布特断裂系就是在本区地壳缩短的背景下产生的走滑断层和推覆构造 相似文献