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本文着重从理论上探讨了近距离中小地震记录中介于直达S波与尾波之间的S波部分(亦称为早至S波)的振幅——时间特征,及其形成机制,与地壳分层结构,震源类型及介质性质的关系。在简化条件下,从数学上求出了早至S波垂直向记录双振幅包络线的形状函数。最后利用得到的公式,计算了几种震源情况下,不同震中距的形状曲线。理论量板曲线与利用宁夏台网资料得到的实测曲线在主要方面符合较好。
This paper focuses on theoretically exploring the amplitude-time characteristics of the S-wave part (also known as early S-wave) intermediate between the direct S wave and the coda wave in the close-range medium- and small-scale seismic records and its formation mechanism, Layer structure, source type and the nature of the medium. Under the simplified condition, the shape function of the dual-amplitude envelope of vertical S-wave recording was obtained mathematically. Finally, using the obtained formula, the shape curves of different epicenter distances are calculated under several kinds of focal points. The theoretical curve of measured plate and the measured curve obtained from Ningxia station network data are in good agreement in the main aspects.