The static corner frequency and dynamic corner frequency in stochastic synthesis of ground motion of finite-fault modeling are introduced, and conceptual disadvantages of the two are discussed.

In the basis of Doppler effect in the process of seismic wave s propagation, the corner frequency of wave P or S can be used to determine the rupture plane under 1D finite moving source model.

Based on those concerned items we have done before with analogue data of BSTN, this time we use the data from DAPS (Data Acquisition and Processing System,A/D at network centre) to analyze the characteristic of waveform, M_L and M_D, predominant period and corner frequency of blasts and small earthquakes.

We had studied and compared the characteristics of wave spectrum of these events and found that the corner frequency and the maximum spectrum are different for explosion,mine tremor and earthquake.

The corner frequency ratio (fC(P)/fC(S) was about 18 before the mainshock;however,it reduced to 13 after the mainshock,where the fC(P) and fC(S) are the amplitudes of P and S waves displacement spectrum at the corner frequency,respectively.

A light frequency equation of inflexion on planck function;