宁夏地区地震目录最小完整性震级分析  

Research on minimum magnitude of completeness for earthquake catalogue in Ningxia region

作　　者：冯亮亮 穆婷 杨波 关文强 石军[2] Feng Liangliang;Mu Ting;Yang Bo;Guan Wenqiang;Shi Jun(Baoji Earthquake Agency,Shaanxi Province 721004,China;Shaanxi Earthquake Agency,Xi’an 710068,China)

机构地区：[1]宝鸡市地震局,中国陕西721004 [2]陕西省地震局,中国西安710068

出　　处：《地震地磁观测与研究》2019年第4期37-44,共8页Seismological and Geomagnetic Observation and Research

基　　金：陕西省地震局启航与创新基金(项目编号:QC201820)

摘　　要：收集宁夏测震台网地震目录资料,采用MBs、EMR、震级—序号、MAXC、gFT等方法,对宁夏境内1970—2017年最小完整性震级Mc时序变化进行综合分析,确定采用EMR方法测定的Mc较为理想,并进一步分析该区Mc时空分布特征。结果显示,宁夏测震台网测震模拟观测、数字化改造及“十五”数字化运行阶段,Mc分别为ML 2.2±0.1、ML 1.7±0.1、ML 1.6±0.1;“十五”数字化运行阶段以来,Mc空间分布不均匀,整体维持在ML 1.3左右。Based on the collected earthquake catalogue and seismic network data of Ningxia Province,the variation of Mc for earthquake catalogue within the territory of Ningxia from 1970 to 2017 is analyzed synthetically in this paper using the various methods such as b-value stability approach(MBS),Entire Magnitude Range(EMR),magnitude-order number,the maximum curvature(MAXC)and the goodness-of-fit test(GFT).It shows that the method of EMR is fit for computing Mc in all kinds methods in Ningxia.The characteristics of spatial distribution is analyzed.The results showed that Mc is ML 2.2±0.1,ML1.7±0.1,ML1.6±0.1 respectively in the stage of analogue observation,digitization observation and the tenth five-year plan.The spatial distribution of Mc since the“tenth five-year plan”is asymmetrical and the value of Mc is about ML1.3.

关 键 词：最小完整性震级 宁夏地区 Mc时空分布 多方法综合分析 

分 类 号：P31[天文地球—固体地球物理学]