陕西地区地震目录完整性分析

Completeness of earthquake catalogues in Shaanxi region

应用完整性震级范围法(EMR)、稳定b值法(MBS)、R—S检验法,对陕西中部、南部地区1970年以来地震目录完整性进行分析,认为:研究区内1970—1997年2.3级以上、1998—2008年1.8级以上、2009年至今1.4级以上地震目录基本完整。应用最大曲率法(MAXC),分析完整性震级的时空分布,结果显示,随着时间的推移,最小完整性震级呈下降趋势,且陕西地震台网监测能力在各区域间存在差异。

Entire magnitude range （EMR） method,Mc byb-value stability （MBS） method and R-S test have been used to analyze the earthquake catalogue in central region and southern region of Shaanxi Province since 1970 in this paper. The results show that the earthquake catalogue during 1970 and 1997 over 2.3 is integrated in our study area; And the minimum magnitude of integrated. earthquakes is from 1.8 for 1997-2008; From 1998 until now magnitude over 1.4 is integrated. In addition, the maximum curvature method （MAXC） is used to analyze the integrity of the magnitude of time and space distribution, the results shows that with the passage of time, the minimum integrity magnitude is on the decline, at the same time, the network monitoring ability to gradually reduce the gap between regions.