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Luyedyck(1970)指出了倾没岩石圈板块的倾角与相应的会聚速率的关系。对任何一个大洋岛弧来说,板块的最大倾角在特定的剖面上表现为:与此剖面至两个板块相向运动的极的距离成反比。他研究了几个大洋岛弧后指出,相应板块段的倾角和相对会聚速率之间普遍存在着反比关系。根据这个作者,这种倾角-速率关系可能是较重的倾没板块向平衡(直立)位置下沉的表现。将此种现象与地震震源机制研究提供的应力资料联系,我们可以获得引人关注的结果。Isacks 和 Molnar(1971)研究了世界上各种活动边缘的下倾应力分布(图4)。他俩
Luyedyck (1970) points out the relationship between the inclination of the decadal lithospheric plate and the corresponding convergence rate. For any oceanic island arc, the maximum dip angle of a plate in a given section is inversely proportional to the distance of the pole from which the section moves to move towards the two plates. After studying several oceanic island arcs, he pointed out that there is a general inverse relationship between dip and relative convergence rates of the corresponding plate segments. According to the author, this dip-rate relationship may be a manifestation of a heavier sinking plate sinking toward a balanced (upright) position. Linking this phenomenon with the stress data provided by the earthquake focal mechanism studies leads to interesting results. Isacks and Molnar (1971) studied the downward stress distribution at the edges of various activities in the world (Figure 4). They both