The Determine of the Paramters of the Moderate Earthquakes in Tangshan Region,Hebei Province

Using the observational datum of the Capital region digital seismological network, the seismic waveform spectra are obtained with the data records of 58 bigger than 2.0 magnitude earthquakes which occurred in Tangshan region in 2002, meanwhile, the seismic moment, corner frequency, stress drop, focal size of each earthquake are calculated. The relations between the source parameters are discussed, and the characters of the corner frequency and stress drop distribution with time are analysed. The results show the relationship between the moment and the magnitude, and that of the corner frequency and the magnitude are consanguineous. This approve that the results are credible.