关键词: 非弹性衰减系数, 场地响应, 震源参数

Abstract: Using the waveform data of M≥2.5 earthquakes from Fujian digital seismic station network since 1998,the inelastic attenuation coefficient,geometric diffusion coefficient,site response and seismic source parameters of seismic waves of Fujian area are calculated based on the algorithms proposed by Atkinson et al. Considering that the site response calculated by Atkinson's method is only the relative response,the method proposed by Moya is used to recalculate the site response. The low frequency level and corner frequency of seismic source spectrum are inversed and the new seismic parameters (seismic moment,stress drop,rupture radius) taking part in the inversion are calculated. In the meantime,the relationships between them are discussed. The inversion results indicate that the relationship between average Q value of Fujian area and the frequency is Q=504.1×f^0.332,and the site response is around 1 and correlated to frequency.This result is coincident to the situation that Fujian digital seismic stations are almost built on the bedrock. Calculations of seismic source parameters suggest that there is good correlations between seismic moment and seismic magnitude,while the correlations between seismic moment and stress drop,the stress drop and source radius are not so well,due to,possibly,the lack of the quantity of earthquakes and the limit of seismic magnitude that take part in the inversion.

Key words: inelastic attenuation coefficient, site response, seismic source parameter