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本文概述了美国地球物理联合会1984年春季年会上首次举办的“震波射线层析图象技术和三维方法”专题讨论会有关文献的内容。震波射线层析图象技术利用近年来日益增多的地震数据,用新的计算技术求得三维图象的地震波速构造,使之满足各种约束条件。求得全球各种地幔深度范围的三维波速分布,并与现行的板块构造分布图作对比,结果表明,在大部分构造活动区,裂谷带、火山区和大洋中脊下面的震波速度是慢的,而地台区下面的波速是快的,另有一些地区的波速分布表现了一定的特殊性,值得进一步研究。谷本等得出的地幔对流图为板块大地构造研究提供了新的定量基础。震波射线层析图象技术已成为研究地球内部物理、化学性质的重要手段。
This paper provides an overview of the relevant literature on the Symposium “Seismic Ray Tomography and 3D Methods” Held for the First Time by the American Geophysical Union in Spring 1984. The seismic ray tomographic image technique utilizes the increasing seismic data in recent years and obtains the seismic wave velocity structure of the three-dimensional image by using the new calculation technique so as to satisfy various constraint conditions. The three-dimensional wave velocity distribution of various mantle depths in the world is calculated and compared with the current plate tectonic distribution map. The results show that the seismic wave velocity below the tectonic activity zone, rift zone, volcanic area and mid-ocean ridge is slow , While the wave velocity under the platform is fast, and the wave velocity distribution in some areas shows certain particularity, which deserves further study. The mantle convection pattern derived from Kawamoto et al. Provides a new quantitative basis for the study of plate tectonics. Seismic ray tomography has become an important method to study the physical and chemical properties of the earth.