利用数字化波形研究内蒙古东部地区非弹性衰减系数、场地响应和震源参数

Study on the Inelastic Attenuation Coefficient,Site Response and Source Parameters in Eastern Inner Mongolia by Digital Waveform

运用内蒙古东部地区11个数字地震台记录的波形资料,通过Atkinson方法和Moya方法反演该地区的非弹性衰减系数和场地响应,得出内蒙古东部地区非弹性衰减Q值与频率的关系,发现11个台站的场地响应基本都在1附近波动,此结果与内蒙古东部地区台站基本布设在基岩之上的实际情况相吻合。震源参数计算结果显示,震级与地震矩、震源尺度及矩震级呈正相关,与拐角频率呈反相关,与应力降无明显关系。

Based on the waveform data recorded by 11 digital seismic stations in eastern Inner Mongolia,the inelastic attenuation coef-ficient and site response are calculated by the Atkinson method and Moya method. The relationship between Q value and frequency of lnelastic attenuation tn eastern Inner Mongolia is obtained. It is found that the site responses of the 11 stat ions are fluctuating in the vicinity of 1, and the resutt s consistent with the actual situation that the stations m eastern Inner Mongolia are basically buitt on bedrock. The results of seismic source parameters show that the magnitude s positively correlated with the seismic moment, the earthquake source scale and the moment magnitude,and has nverse correlation with the corner fretionship with stress drop.