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本文以“面波均匀震级系统”为基础,选用参加均匀震级系统计算的213次地震,取全国25个基准台的面波数据,求出长春台台基校正值Ck及其地区校正值Ri。用上述地震进行内符合检验,当不加校正值时,总体均方差FA=0.03340,加上Ck后FA=0.02629,下降21％。又选出没有参与校正值运算的138次地震进行外符合检验,当不加校正值时,其总体均方差FA=0.03334,加上Ck后FA=0.02564,下降23％。为了进一步提高长春台测定面波震级的精确度,对长春台记录到的213次地震,划分成13个地区,分别求出震级地区校正值Ri,当其加上地区校正值Ri后,绝大部分地区均方差FA都有明显下降。说明本文的方法是合理的,有助于提高单台定震级的精确度。
Based on “surface wave uniform magnitude system”, this paper selects 213 earthquakes that participate in the uniform magnitude system and takes the surface wave data of 25 reference stations in China to find the correction value Ck of Changchun station base station and its regional correction value Ri. The internal coincidence test was conducted with the above earthquakes. When no correction value was added, the overall mean square error (FA) was 0.03340. After adding Ck, FA = 0.02629, a 21% decrease. In addition, 138 earthquakes that did not participate in the calculation of the correction value were selected for the external coincidence test. When no correction value was added, the overall mean square error (FA) was 0.03334. After adding Ck, FA = 0.02564, a decrease of 23%. In order to further improve the accuracy of Changchuntai’s determination of surface wave magnitudes, the 213 earthquakes recorded by Changchun station are divided into 13 regions, and the correction value Ri of the earthquake magnitude region is calculated respectively. When it is added to the regional correction value Ri, In some areas, the mean square error (FA) decreased significantly. This paper shows that the method is reasonable and helps to improve the accuracy of a single fixed magnitude.