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本文利用新不列颠岛两个地震在十二个基本台站所记录到的瑞利波,计算了我国不同地区的相速度.着重讨论鉴别和对比不同台站记录中同一震相的方法.在大部分台站的记录中,见到有周期约为35秒的相位,和后面的位相比较,它的周期较大,振幅较小.波形的对比对初步鉴别震相有很大的帮助.详细的震相对比是根据周期随距离变化的规律和各震相到时的规律.两个地震所得的相速度很符合.计算的结果表明:利用三台计算相速度时,如果射线的路程差别较大,海洋路程的校正是不能忽略的.因为有关我国地壳构造的资料还很少,我们所得的瑞利波相速度只能与普瑞司修正后非洲大陆的相速度理论相比较,由此得到我国不同地区的地壳厚度.这样所得的厚度,虽然不能视为最后的结果,但是它们仍然表现与主要地质单元之间有密切的联系.
In this paper, the Rayleigh waves recorded by twelve basic stations of the new British Isles Island are used to calculate the phase velocities in different regions of our country, and the methods of identifying and comparing the same phases in different stations are discussed. In some stations’ records, a phase with a period of about 35 seconds is seen, which has a large period and a small amplitude compared with the following bits. The comparison of the waveforms is of great help to the initial identification of the phase of the earthquake. The phase contrast of the earthquakes is based on the law of periodicity with distance and the law of the arrival of each seismic phase.The phase velocities obtained by the two earthquakes are in good agreement with each other.The results of the calculation show that if the phase velocities of three phases are calculated, , The correction of the ocean path can not be neglected.Because the information about the crustal structure in our country is still scarce, the phase velocity of Rayleigh wave we obtained can only be compared with the phase velocity theory of Purui Si revised continent, The thickness of the crust in different regions The thickness so obtained, although not considered as the final result, still shows a close relationship with the major geological units.