天津测震台网地震监测能力分析

Evaluation of monitoring capability of Tianjin Seismic Network

通过计算地震台站最小监控震级,得到天津测震台网地震监测能力。采用经典谱估计中的Welch算法,计算天津测震台网31个地震台站噪声水平。取噪声水平有效值的30倍作为能检测到最小地震S波的最大振幅,通过近震震级公式,计算各台站地震震级,取第4个能被检测到的台站地震震级作为最小监控震级。

In this paper, we obtained the monitoring ability of Tianjin Seismic Network by calculating the minimum magnitude the stations monitored. Firstly, using Welch algorithm, a classic spectrum estimation, we calculated the noise level of 31 stations of Tianjin Seismic Network. Take 30 times valid values of the noise level as the maximum amplitude of S wave of the minimum seismic event that monitored. Then calumniated the seismic magnitude of each station using local magnitude formula, and took the fourth seismic magnitude of the station detected as the minimum monitoring magnitude.