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(一)总的情况 1.凡在《中国地震台网观测报告》(以下简称为《报告》)中报出的震级,都取台网测定的平均值,一般用4～12个台求平均。全部使用台数是17个。震源深度小于200公里的浅、中源地震,都测量面波震级Ms,其中P、S的记录最大振幅P_m、S_m大于5毫米也测体波M_B。震源深度大于300公里,仅测M_B。 2.一般都不加台站校正值,仅1967～1969年期间的《报告》中加校正值,依据郁曙
(I) General Situation 1. The magnitudes reported in the “China Seismograph Network Observation Report” (hereinafter referred to as the “Report”) all take the average of the network determination and generally average them with 4 to 12 stations . The total number of use is 17. The shallow and middle source earthquakes with source depth less than 200 km all measure Ms, where P and S record the maximum amplitude P_m and S_m is greater than 5 mm and body-wave M_B. The depth of the focal point is more than 300 km, measured only M_B. 2. Generally do not add station correction value, only 1967 ~ 1969 during the “report” plus correction, according to Yu Shu