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本文利用“中国地区地震 P 波和 S 波走时表”及其相应的地壳地慢速度模型,较详细地讨论了地震波的几何扩散效应,从而制定了一套新的体波震级的起算函数 (PZ)、(PH)和(SH),所得结果表明:地球内部的速度分布是影响震级数值的首要因素。新的值图象与诺特曼和杜达(1983)的 g(△,h)图象非常相像;与传统的古登堡和里克特(1956)的值图象比较,说明后者有待用新近的地震资料作细致的改进。
In this paper, we use the “Earthquake P-wave and S-wave Traveling Timetable in China” and their corresponding crustal slow velocity models to discuss the geometric diffusion effects of seismic waves in more detail. A new set of functions for calculating body wave magnitude (PZ ), (PH) and (SH). The results show that the velocity distribution inside the earth is the primary factor affecting the magnitude of the magnitude. The new value image is very similar to the g (Δ, h) images of Nottermann and Duda (1983); the latter is to be compared with the value images of the traditional Gutenberg and Richter (1956) With the recent seismic data for detailed improvements.