Abstract: By using Ω-square model restrain the source displacement amplitude spectrum of moderate-small earthquakes, the authors developed a simultaneous inversion method of site response, source parameters, geometrical attenuation factors and inelastic attenuation of medium. Numerical simulation shows that this inversion method is reliable. In the southern area of Jiangsu Province, the geometrical attenuation factors preferably accord with the statistical model of three segments attenuation, and the relation between the quality factor and frequency in this area is divided into two sects, one is high frequency segment that the frequency is more than 3.0 Hz and the other is low frequency segment, and the relation between two sects obeys the exponential law, but in the all frequencies, the relation seemly accords with the rheologic model of four elements. The relation between logarithmic moment and magnitude M_L accords with linear relation. The relation between the moment and corner frequency takes on double logarithmic law. When the source radius is smaller than 300 m, the relation between the stress drop and source radius tallies with the theoretical law of the disk static rupture model.

Key words: Source parameters, Medium attenuation, Site response, Simultaneous inversion