Detailed structure of a mantle seismic zone using the homogeneous station method
Detailed structure of a mantle seismic zone using the homogeneous station method
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使用均质台站法研究地幔地震带的详细结构
作者：
J. Ansell;E. Smith
随着地幔地震定位的准确性提高，地幔内地震带的建议厚度已经减少，现在需要进行特别研究以确定这些区域的详细结构。在这项研究中，我们使用的同质站的方法来定位发生在新西兰北岛下的中间深度的地震，并在这里报告说，震源可能位于两个倾斜的表面约9公里的距离。使用板块构造假说，这些表面可能与倾斜的脆性带的顶部和底部有关，要么是下行的洋壳2，3，要么是下行的岩石圈4内的一些较冷的区域。
As the accuracy of location of mantle earthquakes has increased, the suggested thickness of seismic zones within the mantle has decreased1 and special studies are now needed to determine the detailed structure of these zones. In this study we used the homogeneous station method to locate earthquakes occurring at intermediate depths beneath the North Island of New Zealand, and here report that the hypocentres could lie on two dipping surfaces about 9 km apart. Using the plate tectonics hypothesis these surfaces may be related to the top and bottom of a dipping, brittle zone, either down-going oceanic crust2,3, or some colder region within the descending lithosphere4.