地震阈值监测技术中的震级校正

Magnitude Calibration of Seismic Threshold Monitoring

摘要:

地震阈值监测技术能够实现对台网监测能力的实时评估,该方法利用短时平均值(STA)代替A/T来计算震级。为了使STA计算的震级跟传统震级计算结果一致,需要对利用STA计算的震级进行校正。本文通过分析台站检测到的历史事件,选择最优的滤波频带计算log(A/T)与log(STA)之差,得到利用STA计算震级的校正系数。利用新疆地震台网部分台站的数据,分析了阈值监测技术计算的台网监测能力,结果跟实际值基本一致。

Abstract:

Threshold Monitoring（TM） is a method of using real-time seismic data to evaluate the monitoring capability of Seismic network.After preprocessing seismic stations＇ data,short-term average（STA） instead of signal＇s amplitude is used for calculating events＇ magnitude,but it can product bias error.In this paper a method for calculating seismic station＇s parameters of TM system is researched,and magnitude＇s correction coefficents for parts of seismic stations in Xinjiang region are calculated,using the historical event records to choose the optimal frequency band for calculating the difference between log（A/T） and log（STA） in each stations.A correction table for these stations and evaluation of the monitoring capability including these magnitude＇s corrections are reasonable.