利用近场地震加速度记录测定近震震级ML的研究

本文对如何利用强震加速度记录测定近震震级ＭＬ的问题进行了研究，指出了在我国所使用的原始量规函数存在着系统偏差，并用回归现有观测资料的方法修正了这种系统偏差。用修正后的量规函数，利用近场加速度记录计算的ＭＬ值同微震台网所测定的值符合得较好，说明本文所提出的方法是可行的。

DETERMINATION OF NEAR EARTHQUAKE MAGNITUDE M_L USING NEAR-FIELD ACCELEROGRAMS

The objective of this paper is to investigate the determination of local magnitude ML based on strong-motion accelerograms. The effect of the standard attenuation curve,-logA0 ,on the calculation of ML was studied and a systematic effect of distance on the values of ML was found. A new attenuation curve was obtained based on the recorded data,using the least square method. The ML values of three events were redetermined using the new curves and they are very closed to the far-field values of ML. So it is believed that the method proposed in this paper is feasible.