首都圈小震震源参数与介质品质因子

SOURCE PARAMETERS AND QUALITY FACTOR OF THE MEDIUM OF SMALL EARTHQUAKES IN THE CAPITAL CIRCLE

本文用频率域方法和国家地震局分析预报中心京津监视区测震数据传输和处理系统接收的短周期地震模拟信息，通过波形数字化联机处理，测定了首都圈１９９０年末至１９９３年上半年部份小震震源参数和相应路径上的介质品质因子。结果表明，小震应力降为１×１０＾５－１０＾６Ｐａ，介质品质因子为１００－７００之间随地区有差别。

Using the frequency method, the source parameters of small earthquakes from the end of 1990 to June, 1993 in the Capital Circle Area and the quality factor of the medium along the corresponding paths have been determined. The short period analog seismic signals teletransmitted from seismic wave data were obtained through computer online processing system, operated by the Seismometry Data Transmission and Processing for Seismicity Monitoring in the Beijing, Tianjin, Tangshan and Zhangjiakou Region, Center for Analysis and Prediction, SSB. Results show that the stress drops for small earthquakes are a few 105Pa to tens 105Pa and Q-Value is between 100 and 700 for the different regions.