地球内部结构的研究显示,上地幔中400km深度附近存在一个波速和密度的间断面,通常称为410km间断面.普遍认为,橄榄岩α态与β态之间的转换导致了这个间断面的形成,而且在PREM等被广泛采用的地球模型中,这一间断面通常被处理为一个尖锐的跳变.然而,近年来的一些研究提出该间断面在某些地区存在着更复杂的结构.利用欧洲台网所观测到的宽频带数据,对发生在意大利中部的1998-05-18地震事件进行了分析研究,在PREM模型的基础上,通过对不同的410km间断面结构模型的波形模拟,得到了更适用于这一区域的半跳变半渐变模型. Studies of the Earth’s interior structure show that there is a discontinuity of velocity and density near the depth of 400 km in the upper mantle, commonly referred to as the 410 km discontinuity. It is generally accepted that the transition between the alpha and beta states of the olivine results in the formation of this discontinuity , And this cross-section is often treated as a sharp jump in the widely adopted Earth model such as PREM However, some recent studies have suggested that there are more complex structures in some areas of the intercept, Based on the PREM model, the waveforms of different 410km cross-section structural models were obtained and analyzed. The broadband data observed by the European network were used to analyze the earthquakes occurred in the center of Italy from May 18 to 18, A more suitable for this region half-jump half-gradient model.