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研究地球物质的弹性和耗散性质,在很大程度上是依靠长周期面波和地球固有振荡的观测资料。这样,根据符合瑞雷和乐夫波频散资料的不同模式得出了上地幔明显各向异性的结论。基于分析固有振荡的周期作出了关于地球内核硬度的结论;地球物质品质因子随深度的分布是根据固有振荡衰减的资料计算出来的。所以得到关于长周期面波和地球固有振荡性质的资料是当代观测地震学的现实问题。而解决这个问题,首先需要建立具有足够大的放大倍数记录(地表振动)周期达1小时以上的专门的长周期仪器。
Studying the elastic and dissipative properties of the Earth depends to a great extent on long-period surface waves and Earth’s natural oscillations. In this way, the conclusion is drawn that the anisotropy of the upper mantle is based on different modes consistent with the Rayleigh and Leff wave dispersion data. The conclusion about the hardness of the Earth’s core is made based on the analysis of the natural oscillation period; the distribution of the Earth’s mass factor with depth is calculated from the data of natural oscillation attenuation. Therefore, obtaining information on the properties of long-period surface waves and Earth’s natural oscillations is a real problem in contemporary seismology observation. To solve this problem, first of all, it is necessary to establish a specialized long-period instrument with a sufficiently large magnification record (surface vibration) period of more than 1 hour.