航天技术的发展不仅使人类上了天,而且还登上了月球。然而对我们脚下的地球,由于技术的限制,还只能依靠对地震波的研究来获得关于地球内部的知识。当地震发生时,地下岩石受强烈冲击,产生弹性震动,并以横波和纵波的形式向四周传播,当地震波通过不同物质时,波速会发生变 The development of aerospace technology not only made mankind to heaven, but also boarded the moon. However, due to technological constraints, the Earth under our feet can only rely on the study of seismic waves to gain knowledge about the interior of the Earth. When the earthquake occurred, the underground rock was strongly shocked, resulting in elastic vibration, and in the form of transverse and longitudinal waves around the spread, when the seismic waves through different substances, the wave velocity will change