黑龙江地区地震目录最小完整性震级时序演化特征  

Temporal variation analysis of the minimum magnitude of completeness for earthquake catalog in the Heilongjiang area

作　　者：马艳丽 姜锦华 张雁翔 张盛峰 MA Yanli;JIANG Jinhua;ZHANG Yanxiang;ZHANG Shengfeng(Heilongjiang Earthquake Agency,Harbin 150090,China;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)

机构地区：[1]黑龙江省地震局,哈尔滨150090 [2]中国地震局地震预测研究所,北京100036

出　　处：《地震地磁观测与研究》2024年第5期34-39,共6页Seismological and Geomagnetic Observation and Research

基　　金：吉林长白山火山国家野外科学观测研究站项目(项目编号:NORSCBS21-08);黑龙江省地震局局内科研课题(项目编号:202312)。

摘　　要：地震目录数据是当前进行地震预测预报及危险性分析的重要资料,而反映地震目录质量水平的最小完整性震级评估又是开展这些工作的重要基础。整理黑龙江省及邻区(42°—54°N,120°—136°E)1970—2022年地震目录,应用震级—序号法分析地震密度随时间的演化特征,同时应用多参数方法,即拟合度分别为90%和95%的拟合优度检测法,分析最小完整性震级的时序演化特征。结果显示:1970—1983年,研究区由于地震台站数量较少,M_(c)评估结果约为M_(L) 3.0—2.5;1984—2006年,地震台站运行较稳定,地震台网监测能力有所提高,M_(c)评估结果约为M_(L) 2.5—2.0;2007—2022年,经“十五”数字地震观测网络项目升级和改造,地震台网监测能力提升,M_(c)稳定在M_(L) 2.0—1.5。The earthquake catalog is a crucial source of information for earthquake forecasting and risk analysis,and the minimal completeness magnitude evaluation that reflects the catalog’s degree of quality serves as a crucial foundation for these efforts.In this study,the earthquake catalog from Heilongjiang Province and surrounding areas(42°-54°N,120°-136°E)from January 1970 to December 2022 was organized,and the magnitude-sequence number method and multiparameter method were used to analyze the temporal evolution characteristics of the minimum comleteness magnitude.According to the findings,the small number of seismic stations in the study area between 1970 and 1983 caused the M_(c) assessment result to be about M_(L) 3.0-2.5;during the stable analog observation period from 1984 to 2006,the seismic monitoring capability was improved,and the M_(c) assessment result was about M_(L) 2.5-2.0;and from 2007 to 2022,the upgrade and transformation of“the tenth five-year plan”digital seismic observation network project was carried out,and the M_(c) was stable at M_(L) 2.0-1.5.

关 键 词：黑龙江及邻区 地震目录 最小完整性震级 时序演化特征 

分 类 号：P315.6[天文地球—地震学]