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引言 文献[6、9]综合分析现有理论结果和实验资料之后,得出结论:来自地壳和地幔中的速度变化较小的大量亚水平界面的反射横波形成了短周期(T=1秒)Lg尾波,其形成的时间较长。根据这个结论可以制定出以Lg波群和尾波强度的对比分析为基础详细编绘上地幔吸收图的方法,曾用Lg波群和尾波的强度研究过天山地区的吸收场特征[8]。文献[9、11]早已指出,在一些小区域绝大部分短周期尾波包线的形态都很稳定。只是某些地区的地
INTRODUCTION After a comprehensive analysis of the existing theoretical and experimental data in the literature [6,9], it is concluded that the reflected transverse waves from a large number of sub-horizontal interfaces with small changes in velocity in the crust and the mantle form a short period (T = 1 second) Lg coda wave, the formation of a longer time. Based on this conclusion, a detailed mapping method of upper mantle absorption can be developed based on the comparative analysis of Lg wave groups and coda wave intensities. The absorption field characteristics of the Tianshan area have been studied by the intensities of Lg wave groups and coda waves [8] . It has long been pointed out in the literature [9, 11] that the shape of most short-period coda wave envelopes is stable in some small areas. Just some areas of the land