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本文所述的 L_g 波,是指 L_(g1)震相,在我国通称为震相。一般认为可用高阶振型面波理论来解释 L_g 波的传播。关于 L_g 波传播的特点,可用下面两段话作简要的说明。Bth(1973)写道:“研究表明,短距离大陆地震的记录中有一个震相的振幅比 S_g大,而被误认为 S_g 震相。这种波就是 L_(g1)。它的波速为3.54Km/sec,S_g 波波速为3.37Km/sec。在分析通过大陆传播的地震和爆炸的记录时,必须注意 S_g 波和 L_(g1)波,不要混淆,不要误认为是一种波。赵荣国(1980)经对大量地震图的分析后表明:“除西藏高原地区外,L_g 波在亚州东部的浅源地震图上,是最常见的比较容易识别的也是比较实用的震相,可以
L_g wave described in this paper refers to L_ (g1) seismic facies, commonly known in our country as seismic facies. It is generally considered that the propagation of L_g waves can be explained by the theory of higher order mode shapes. On the characteristics of L_g wave propagation, the following two paragraphs can be used for a brief description. Bth (1973) writes: “The study shows that the amplitude of a seismic phase in a short-range continental earthquake record is larger than S_g and mistaken for the S_g phase, which is L_ (g1). Its velocity is 3.54 Km / sec, S_g wave velocity of 3.37Km / sec. In the analysis of the records of earthquakes and explosions transmitted through the mainland, we must pay attention to S_g wave and L_ (g1) wave, do not confuse, do not mistaken for a wave. 1980) The analysis of a large number of seismograms shows that: ”Except for the Tibet Plateau, L_g waves are the most common and relatively easy to identify and relatively practical seismic facies on shallow source seismograms in eastern Asia.