关键词: 数字地震台网, 地震定位, 首都圈

Abstract: The newly developed Digital Seismic Network in Capital Circle consists of 107 stations, the seismic monitoring and epicenter determination capabilities of which need to be verified. In epicenter determination, we should bring the superiority of digital seismic record into full play, and improve the reliability and precision of epicenter determination by using the corresponding digital processing technique. In this study, several digital processing techniques, including digital filtering, polarization analysis, station scanning and phase tracing, are used for improving the phase identification in the epicenter determination. Totally, 7 microearthquakes(M_L<2.0)recorded by the Digital Seismic Networks in Capital Circle in 2,000 were located precisely by using the Geiger method. In addition, the reliability and precision of the method and program have been verified by determining the epicenters of artificial events. It is shown that the error of epicenter location is less than 2.0km and the error of focal depth determination is less than 3.0km. The results of this study can be used for evaluating the seismic monitoring capability of the Digital Seismic Network in Capital Circle.

Key words: Digital Seismic Network, hypocenter determination, Capital Circle