地震阈值监测技术的研究与应用

Study and Application of Seismic Threshold Monitoring

阈值监测技术是一种利用地震台站实时数据反映台网监测能力变化的方法。对台站数据进行预处理后,计算短时平均值STA作为信号能量的估计来计算震级,由概率统计方法实现对地震台网监测能力变化的动态监测。文中给出了利用短时平均值STA和震中距计算震级的公式;采用新疆地区部分地震台站的数据,并以新疆地震目录给定的ML为准,对相关的地震台站计算震级所需参数进行了标定;最后结合实例说明定点阈值监测技术的应用,分析了新疆专用地震台网在某一时间段内对定点区域的监测能力。

Threshold Monitoring is a method that using real seismic data to evaluate the monitoring capability of Seismological network. After pretreatment to data of seismic stations, the shortterm average （STA） instead of signal＇s amplitude is used for calculating events＇ magnitude. In this article a formula which using short-term average and epicentral distance to compute events＇ magni- tude is given. Seismic data from Xinjiang network are used to emendate magnitude of seismic stations. At last, an example to show how to use site-specific threshold monitoring is given and Xin- jiang network＇s monitoring ability in target area is analyzed.