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目前广泛使用的面波震级M_S和近震震级M_L之间的经验转换式为:M_S=1.13M_L-1.08,该关系式是郭履灿先生根据邢台地震资料建立,实践证明,该式在全国范围内不具备普适性;特别是近年来,随着全国地震台网的逐步完善和地震监测能力的提高,积累了大量精度高、完整性好的地震资料,我们更有必要充分利用新的地震资料,建立M_S和M_L之间新的震级转换关系式。本文充分利用中国地震台网1990.1～2007.12.31的观测资料,对比分析使用最小二乘线性回归方法和正交回归方法进行拟合的优越性和差异性,选取具有对称性质的正交回归方法进行拟合,从而保证了数据处理结果的一致性;同时,本文基于中国地震区带的划分方案,对地震区、带内的面波震级M_S和近震震级M_L之间的关系进行分区对比研究,分别建立了中国大陆及邻区、中国东、西部以及中国及邻区七个地震区的面波震级M_S与近震震级M_L之间的经验公式,本文的研究结果可作为M_S、M_L地震震级间相互换算的参考公式,对地震活动性参数的确定、工程场地地震安全性评价、地震活动中长期预测均有重要意义。
The empirical transformation between the currently used surface wave magnitude M_S and the near-earthquakes magnitude M_L is: M_S = 1.13M_L-1.08. This relation is established by Mr. Guo Lutan based on the Xingtai seismic data. Practice has proved that this formula is not implemented nationwide In recent years, with the gradual improvement of the national seismic network and the improvement of seismic monitoring capabilities, a great deal of seismic data have been accumulated with high precision and completeness. It is even more necessary for us to make full use of new seismic data, Create a new magnitude conversion relationship between M_S and M_L. This paper makes full use of the observed data of China Seismological Station from 1990.1 to 2007.12.31, compares the superiority and difference of fitting using the least-squares linear regression method and orthogonal regression method, selects the orthogonal regression method with symmetry In the meantime, based on the division scheme of China’s seismic zone, this paper carries out a regional comparative study on the relationship between the surface wave magnitude M_S and the near-earthquakes magnitude M_L in the earthquake zone and the belt, The empirical formulas between the surface wave magnitude M_S and the near-earthquakes magnitude M_L in China, the adjacent areas, the eastern, western, and Chinese and adjacent areas in China are respectively established. The results of this paper can be used as the empirical formula for the M_S and M_L earthquakes The mutual conversion reference formula is of great significance to the determination of seismicity parameters, the safety evaluation of the earthquake site, and the long-term prediction of seismic activity.