基于PMC方法评估青海省测震台网监测能力  

Evaluation of themonitoring capability of the Qinghai Regional Seismic Network based on the PMC method

作　　者：郭瑛霞 张丽峰[1] 顾勤平[2] 黄浩[1] 李振凯 马丽[1] GUO Yingxia;ZHANG Lifeng;GU Qinping;HUANG Hao;LI Zhenkai;MA Li(Qinghai Earthquake Agency,Xining 810001,China;Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]青海省地震局,中国西宁810001 [2]江苏省地震局,中国南京210014

出　　处：《地震地磁观测与研究》2022年第5期23-32,共10页Seismological and Geomagnetic Observation and Research

基　　金：2022年青海省地震局地震科学基金课题(项目编号:2022B01);2022年度震情跟踪定向工作任务(项目编号:2022010504);青海格尔木青藏高原内部地球动力学野外科学观测研究站专项。

摘　　要：采用基于概率的最小完整性震级方法(PMC),对青海省测震台网稳定运行以来实际产出的地震观测报告数据(2014—2021年)进行分析,获得该台网单台检测概率(P_(D))、合成检测概率(P_(E))以及基于概率的最小完整性震级(M_(P))的空间分布。通过对青海及邻区地震监测能力的评估,获得如下认识:青海测震台网监测能力存在明显的空间差异,其中:在台站分布较为密集的青海东部、中部地区,地震监测能力较好,M_(P)分别为M_(L) 1.5—2.0和M_(L) 1.8—2.5;在台站分布较为稀疏的青海西部和南部地区,地震监测能力则相对较差,M_(P)分别为M_(L) 2.5—3.5和M_(L) 2.2—2.7;在台站分布最为稀疏的青藏交界地区,地震监测能力最差,M_(P)约为M_(L) 2.5—3.5。对青海测震台网监测能力的科学评估,可为进一步改善台网空间布局提供参考依据。This study analyzes seismic observations of the Qinghai Regional Seismic Network after its stable operation(20140101-20211231)based on the probability-based magnitude of completeness(PMC)method to obtain the spatial distributions of single station detection probability(P_(D)),synthetic detection probability(P_(E)),and the probability-based magnitude of completeness(M_(P)).Through the evaluation of the seismic monitoring capability in Qinghai and its adjacent areas,the following conclusions are obtained:the monitoring capability of the Qinghai Seismic Network has obvious spatial differences.In eastern and central areas of Qinghai where the stations are more densely distributed,the seismic monitoring capability is better,with M_(P) values of M_(L) 1.5-2.0 and M_(L) 1.8-2.5,respectively.In the western and southern areas of Qinghai where the stations are sparse,the seismic monitoring capability is relatively poor,with M_(P) values of M_(L) 2.5-3.5 and M_(L) 2.2-2.7,respectively.The seismic monitoring capability is the worst in the Qinghai-Tibet border area where the stations are most sparsely distributed,with an M_(P) value of about M_(L) 2.5-3.5.The scientific evaluation of the monitoring capability of Qinghai Seismic Network can provide a reference for further improving the spatial layout of the network.

关 键 词：最小完整性震级 基于概率的完整性震级方法(PMC) 监测能力评估 青海测震台网 

分 类 号：P315.78[天文地球—地震学]