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中国地震局副局长修济刚表示,地震震级是根据不同地方的地震台站所记录到的地震波的振幅和周期来综合测出的,这次汶川地震震级修订是逐步的,是正常的。
Xiu Jigang, deputy director of China Earthquake Administration, said the magnitude of the earthquake was comprehensively measured based on the amplitude and period of the seismic waves recorded by the seismic stations in different places. This revision of the Wenchuan earthquake magnitude is a gradual and normal one.