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Title:: Earthquake-catalogue Completeness of the Small Earthquakes in the Southern Tectonic Region of the Tianshan Mountain,Xinjiang in Different Periods

Author(s):: WANG Qiong; QU Yan-jun; GAO Ge; NIE Xiao-hong; (Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

Keywords:: southern tectonic region of Xinjiang; different periods; analysis of completeness the of small earthquake catalogue; Tianshan Mountain

摘要:: 依据天山地区地质构造、运动强度和历史地震活动的差异性,将南部天山地区划分为南天山东段和南天山西段两个构造区。考虑到新疆台网建设的区域差异性和时间的阶段性,在对两个构造区不同震级下限地震频度时间特征分析的基础上,研究了各构造区不同时段的G—R关系和震级分布特征,并运用Z检验方法对各区不同时段小地震目录差异的显著性进行了分析,进而评估了两个构造区1970年以来不同时段的小地震目录完整性,为区域地震活动性研究中地震目录的合理运用提供参考依据。

Abstract:: According to geological tectonics,motion strength and the difference between the historical earthquake activities in the Tianshan Mountain region,we divide the South Tianshan Mountain into two tectonic regions—the eastern segment and the western one.Considering the fact that the sub-stations of Xinjiang Seismic Network was established in different periods and distributed not so well,and based on the analysis of the frequency character with the different magnitude thresholds in the two tectonic regions,we study G-R expression and character of magnitude distribution in different periods in the two regions,and apply Z Test to analyze the difference between the small earthquake catalogues in different periods,then we evaluate the catalogue completeness of small earthquakes in different periods since 1970.The result may provide reference for people to apply reasonably the earthquake catalogue to the regional seismicity research.