Abstract:Based on the earthquake events since 1970 measured by the Guangxi regional seismic network, we use magnitude-rank, MAXC and GFT methods to analyze the temporal characteristics of minimum magnitude of completeness (MC), and use EMR method to analyze the spatial distribution of MC value. The results show that, with the increase in the number of seismic stations and the optimization of their layout, the scope and magnitude of seismic monitoring in Guangxi and its adjacent areas are significantly enhanced by time, and the MC value decreases as a whole. The time series shows that the MC value of Guangxi and its adjacent areas was about 2.0 to 2.5 from 1970 to 2007, 1.8 to 1.9 from 2008 to 2016, but dropped to about 1.4 to 1.8 after 2017. The spatial heterogeneity of MC value in western, southeastern and northern Guangxi is relatively significant in different periods. The MC value in western Guangxi is small, followed by that in southeastern Guangxi and is largest in northern Guangxi. After 2008, the MC value in western Guangxi is 0.6 to 1.6, and that in southeastern and northern Guangxi is 1.8 to 2.0.
LI Sha,YAN Chunheng,ZHOU Bin et al. Research on the Spatial and Temporal Distribution of Minimum Magnitude of Completeness for Earthquake Catalog in Guangxi and Its Adjacent Areas[J]. jgg, 2023, 43(7): 728-733.