Distribution Characteristics of the Month-Scale Number for Earthquakes Occurred on the Longmenshan Fault

• 责任者：Chen Xuezhong (Institute of Geophysics ; CEA ; Beijing 100081 ; China) ; Guo Xiangyun
• 刊名：Earthquake
• 出版年：2010
• 卷期：30(2)
• 关键词：地震活动性 ; seismicity ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.20-28
• 图表：8 illus., 1 table, 15 refs.
• 分类号：0500
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

The Kolmogorov-Smirnov test is used in this paper to test the distribution of month-scale number of small earthquakes occurred in the Longmenshan fault, oft-com:office:smarttags" />Sichuan, China. The results show that the distribution of the semi-anual number for M_L≥3.0 earthquakes occurred since 1970 agrees with normal distribution, and that of the monthly number for M_L≥2.0 earthquakes occurred since 2000 agrees with the Poisson distribution. Analyzing further the changes of distributions of the monthly number and the semi-anual number with time, it is found that before the two earthquakes with M_S5.0 in September and November of 1999 and the Wenchuan M_S8.0 earthquake, the distribution of the semi-annual number for M_L≥3.0 earthquakes changes abnormally, and the distribution of the monthly number for M_L≥2.0 earthquakes changes obviously prior to the Wenchuan M_S8.0 earthquake.oft-com:office:office" />