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 Mc assessment result to be about ML 3.0-2.5;during the stable analog observation period from 1984 to 2006,the seismic monitoring capability was improved,and the Mc assessment result was about ML 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 Mc was stable at ML 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
Key words
Heilongjiang area/earthquake catalogue/minimum magnitude of completeness/temporal variation
维普
万方数据