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大地震辐射的地震波穿过整个地球。因为这些波仅在地球内部传播,所以经历了多次反射,并且沿相反方向传播的波之间的相互干涉形成了一种驻波形态:地球的简正振型(图1)。这些“体”波也受到传播它的介质的影响。因此它也就带有关于地球弹性分布和间断位置的有价值信息。
Seismic waves radiated by a large earthquake pass through the earth. Because these waves propagate only within the earth, they undergo multiple reflections and the interference of waves traveling in the opposite direction creates a standing wave pattern: the earth’s simple normal mode (Figure 1). These “body” waves are also affected by the medium that transmits it. Therefore, it also contains valuable information about the elastic distribution and discontinuity of the Earth.