共查询到20条相似文献，搜索用时 281 毫秒
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Current plate motions 总被引：57，自引：0，他引：57
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Mantle flow and plate motions 总被引：1，自引：0，他引：1
J. F. Harper 《Geophysical Journal International》1986,87(1):155-171
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J. F. Harper 《Geophysical Journal International》1978,55(1):87-110
Summary. A dynamical theory of flow in the asthenosphere is developed by treating it as a thin layer of Newtonian viscous fluid, pushed horizontally by the dense sinking slabs attached to some plates and by the differences in heating under continental and oceanic crust. Two-dimensional lubrication theory is adapted to give the world-wide effects of inflow to the asthenosphere at the slabs, outflow to the plates at mid-ocean ridges, and the horizontal forces applied at the slabs. The resulting torque balance for the plates is better than any previously published, and leads one to conclude that the asthenosphere's viscosity is least at the top. 相似文献
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The rates of plate creation and consumption 总被引：1，自引：0，他引：1
Barry Parsons 《Geophysical Journal International》1981,67(2):437-448
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Young tracks of hotspots and current plate velocities 总被引：26，自引：0，他引：26
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A model of plate kinematics in Gondwana breakup 总被引：2，自引：0，他引：2
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Summary. Five major convergent plate boundaries (South America, Izu–Bonin–Marianas, New Hebrides, Tonga–Kermadec and Indonesia) show strong variations in levels of background seismicity on scales ranging from tens to thousands of kilometres. These variations were tested using two statistical approaches and we conclude that small earthquakes are not distributed randomly along these zones.
Two types of large-scale seismicity variations (termed first order) were recognized. First, regions with dimensions on the order of 100 km with extremely high seismicity levels (first-order actives). One such region was recognized in each of the zones studied. Second, large-scale (500 to several thousand kilometres) differences in the level of background seismicity along a given plate boundary. Regions with consistent levels of background seismicity are termed first-order segments.
We examined each first-order segment for smaller scale variations. Ten regions ranging in length from 40 to 170 km with anomalously high seismicity levels were recognized. Fifty-three regions ranging in length from 25 to 355 km were found to have anomalously low seismicity levels. Thus, areas with anomalously high levels of activity are rare in subduction zones.
These observations indicate that background seismicity in subduction zones is not randomly distributed along the strike of the zones. It seems likely that the observed variations reflect tectonic differences. In fact, many of the seismicity variations which we observed appear to be spatially related to features on the seafloor or on the overriding plate. If this is so, then they may provide a powerful tool for characterizing subduction zones and understanding the mechanisms of earthquake generation. 相似文献
Two types of large-scale seismicity variations (termed first order) were recognized. First, regions with dimensions on the order of 100 km with extremely high seismicity levels (first-order actives). One such region was recognized in each of the zones studied. Second, large-scale (500 to several thousand kilometres) differences in the level of background seismicity along a given plate boundary. Regions with consistent levels of background seismicity are termed first-order segments.
We examined each first-order segment for smaller scale variations. Ten regions ranging in length from 40 to 170 km with anomalously high seismicity levels were recognized. Fifty-three regions ranging in length from 25 to 355 km were found to have anomalously low seismicity levels. Thus, areas with anomalously high levels of activity are rare in subduction zones.
These observations indicate that background seismicity in subduction zones is not randomly distributed along the strike of the zones. It seems likely that the observed variations reflect tectonic differences. In fact, many of the seismicity variations which we observed appear to be spatially related to features on the seafloor or on the overriding plate. If this is so, then they may provide a powerful tool for characterizing subduction zones and understanding the mechanisms of earthquake generation. 相似文献
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Current plate motions across the Red Sea 总被引：3，自引：0，他引：3
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Summary. The surface gravity anomalies for a three-dimensional density model of a dipping lithospheric plate under the Aegean island arc and the Aegean Sea in Greece in the eastern Mediterranean Sea have been calculated. Such a dipping plate has been suggested in geophysical investigations. The calculated gravity maximum over the dipping plate is located in the area of the largest observed Bouguer anomalies inside the island arc. It is suggested that this should be taken into account in studies of crustal structure and gravity in the area. 相似文献
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A simple model of plate generation from mantle flow 总被引：2，自引：0，他引：2
David Bercovici 《Geophysical Journal International》1993,114(3):635-650
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Stephen Zatman Richard G. Gordon Kartik Mutnuri 《Geophysical Journal International》2005,162(1):239-248
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The eastern and western fronts of plate movement in Taiwan Island and Tibetan Plateau respectively are the two major sources of tectonic force for the morphogensis during Quaternary in China′s tropics. Seven examples of geomorphological effects of plate movement are enumerated to discuss the differentiation of tectonic landforms in space and time during Quaternary. The tectonic movement tends to be more active since middle Pleistocene. Some phenomena such as the arc-shape mountain systems, volcanism and crustal deformation imply that the juncture zone of eastern and western tectonic forces is located at about 1 1O°E. 相似文献
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On the relative importance of the driving forces of plate motion 总被引：4，自引：0，他引：4