广西测震台网监测能力计算与分析

Calculation and Analysis of the Seismic Network Monitoring Capability in Guangxi

依据地方性震级公式,采用台站台基噪声值反推震中距最小震级方法对当前参与地震速报的广西测震台网监测能力进行计算,得到当前广西区域地震监测能力基本达到M_(L)1.4,与邻省交界处的监测能力基本达到M_(L)1.6,北部湾区域达到M_(L)1.8;若把广西“十二五”项目新增的测震台站纳入到地震速报工作中,则广西地震监测能力将提升达到M_(L)1.2。采用最小完整性震级(EMR)方法计算广西及邻区2008—2020年地震目录得到区域最小完整性震级MC值为M_(L)1.7,较同等地震编目台站条件下利用台站噪声值计算得到的监测能力大0.1级,说明通过台基噪声计算得到的区域地震监测能力较能真实体现当前监测能力。

According to the local earthquake magnitude formula,this paper uses the station base noise value to inversely calculate the minimum magnitude of the epicenter distance to calculate the current monitoring capacity of the Guangxi seismic network.Through calculation,it is obtained that the regional seismic monitoring capacity of Guangxi basically reaches M_(L)1.4.The monitoring capability of the provincial junction basically reached M_(L)1.6,and the Beibu Gulf area reached M_(L)1.8.After the completion of the"the 12th Five-Year Plan"project in Guangxi,the earthquake monitoring capacity of Guangxi will reach M_(L)1.2.The minimum integrity magnitude(EMR)method is used to calculate the earthquake catalog of Guangxi and neighboring areas from 2008 to 2020,and the regional minimum integrity magnitude MC value is M_(L)1.7,which is 0.1 level larger than the calculated by using the station noise value under the same seismic catalogin station conditions.It shows that the regional seismic monitoring capability obtained from the calculation of base noise can truly reflect the current monitoring capability.