Abstract
This paper gives revised formulas for Chinese earthquakes, describing the relationship between earthquake magnitude, epicentral intensity and hypocentral depth, and these formulas have been derived from calculations of the data of M, I_0 and h of 57 main shocks. Data have been analyzed of foreshocks and aftershocks of several major earthquakes in North China, from which the relationships between magnitude and epicentral intensity for foreshocks and aftershocks are derived. These relationships are also calculated for earthquakes of the Xinfengjiang reservoir. A comparison between these relations indicates that each of the foreshocks, aftershocks and reservoir earthquakes possesses a specific relationship between magnitude and epicentral intensity of itself, which is systematically different from that of the mainshocks.
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