福建地区地震波非弹性衰减Q值、场地响应及震源参数研究

Research on Inelastic Attenuation Q-value,Site Response and Source Parameters in Fujian Region

利用Atkinson方法结合福建数字地震台网28个数字地震台记录的70个地震事件波形资料,对福建地区的非弹性衰减系数进行研究,得出福建地区介质平均Q值与频率f的关系式。利用Moya方法分别计算了福建台网"九五"和"十五"系统的台站场地响应,共获得37个地震台站的场地响应。最后根据Brune模型计算了2000年1月1日至2011年9月30日福建台网记录的省内及临近海域ML2.5以上157次地震的震源参数,这些地震ML震级与地震矩M0在单对数坐标下成线性关系,与震源尺度及应力降没有明显相关性。

Firstly, using 70 seismic events waveform recorded by 28 digital seismic stations in Fujian digital seismic network, we calculated the inelastic attenuation coefficient by Atkinson＇s method and obtained the relationship between average Q -value and frequency in Fujian region. Secondly, we calculated site responses of stations in the ＂Ninth Five-years＂ and ＂Tenth Five-years＂ plans respectively in Fujian digital seismic network by Moya Method, and obtained site responses of 37 stations. Finally, according to Brune model, we calculated the source parameters of 157 ML t〉2. 5 earthquakes which is recorded by Fujian digital seismic network occurred in Fujian and its adjacent sea area from Jan. 1, 2000 to Sep. 3, 2011. There was a linear relationship between ML of these earthquakes and seismic moment Mo in the single-logarithmic coordinates, but there wasn＇t evident cor- relation between ML and source scale, stress drop.