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为了改进中国地震台网体波震级的测定工作,本文利用“中国地区地震P波和S波走时表”及其相应的地壳地幔速度模型和“地球的吸收带Q值模型”(简称ABM-Q值模型),讨论了地震波的几何扩散效应和地球介质的吸收效应;通过数值计算,制定了中国地震台网体波震级的综合起算函数。经初步使用检验表明,新的震级起算函数,由于引进了与周期相对应的补偿,使得所测不同周期的体波震级基本趋向一致,改善了Gutenberg和Richter(1956)的起算函数在短周期上低估震级的倾向;而且,ABM-Q值模型较之SL8-Q值模型更加符合体波的衰减特性。
In order to improve the determination of body wave magnitude in China’s seismological network, this paper uses the Earthquake P-wave and S-wave Travel Timesheet in China and their corresponding crust and mantle velocity models and the Q value model of the Earth’s absorption band (abbr. ABM-Q Value model), the geometric diffusion effect of seismic wave and the absorption effect of the earth medium are discussed. The integrated initial function of the seismic wave magnitude of China Seismological Network is established by numerical calculation. The initial use test shows that the new magnitude starting function, due to the introduction of the cycle corresponding to the compensation, making the measured body waves of different cycles basically the same trend, improved Gutenberg and Richter (1956) starting function in the short cycle Underestimate the magnitude of the propensity; Moreover, ABM-Q value model more in line with the SL8-Q value of the body wave attenuation characteristics.