亚欧大陆地震活动的空间谱分析

本文将谱分析方法应用于亚欧大陆地震活动的空间序列分析,发现本大陆地震活动在南北向和东西向上均存在等间距分布特征,并得到以4°、7.4°、12.8°、27.6°左右为主周期的空间谱结构。根据Wagner大地水准面资料得出了地幔对流模式,结果表明亚欧大陆正处在四面受压的力学对抗环境中。用板壳与柱壳模型所作的简化计算表明,上述主周期谱系可能是大陆上部厚度分别为15km、40km、120km和600km左右的地层受压屈曲产生的。

A SPACE-SPECTRUM ANALYSIS ON ASIA-EUROPE CONTINENTAL SEISMICITY

In this paper the method of spectrum analysis has been used to study the space series of Asia-Europe continental seismicity. It is obtained that the earthquakes are almost in equidistant distribution in south-north direction and east-west direction. Four main cycles about 4°,7.4°,12.8°,27.6° in the space spectrum are obtained. The patterns of the mantle convection derived from Wagner's geoidal surface show that our continent is pressed in all directions. According to the computation on the basis of a plate-shell model and a columnar-shell model,it is probable that above the four main cycles of seismicity,the space-spectrums are separately caused by the different layers which are buckled,the thicknesses of these layers being respectively about 15 km,40 km,120 km or 600 km.