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地震 ›› 2010, Vol. 30 ›› Issue (2): 20-28.

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龙门山断裂带地震活动的月尺度频度分布特征

陈学忠, 郭祥云, 李艳娥   

  1. 中国地震局地球物理研究所, 北京 100081
  • 收稿日期:2009-06-11 修回日期:2009-09-21 出版日期:2010-04-30 发布日期:2021-10-18
  • 作者简介:陈学忠(1963-), 男, 重庆永川人, 研究员, 主要从事数字地震学、 地震成因和地震预报方法等研究。
  • 基金资助:
    地震科学联合基金(106024)和地震行业科研专项(200708023)资助

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

CHEN Xue-zhong, GUO Xiang-yun, LI Yan-e   

  1. Institute of Geophysics, CEA, Beijing 100081, China
  • Received:2009-06-11 Revised:2009-09-21 Online:2010-04-30 Published:2021-10-18

摘要: 利用Kolmogorov-Smirnov分布检验法, 对龙门山断裂带地震活动的月尺度频度分布进行了检验。 结果表明, 1970年以来ML≥3.0地震活动半年频度符合正态分布, 而2000年以来ML≥2.0级地震活动月频度符合泊松分布。 对半年频度和月频度分布随时间的变化做了进一步分析, 发现在1999年9月、 11月四川绵竹2次MS5.0地震前和汶川MS8.0地震前, 龙门山断裂带ML≥3.0地震活动半年频度分布均表现出明显的异常变化, 在汶川地震前ML≥2.0地震活动月频度分布出现异常变化。

关键词: 龙门山断裂带, 地震活动, 月尺度频度, 分布特征

Abstract: 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, Sichuan, China. The results show that the distribution of the semi-anual number for ML≥3.0 earthquakes occurred since 1970 agrees with normal distribution, and that of the monthly number for ML≥2.0 earthquakes occurred since 2000 agrees with the Possion 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 MS5.0 in September and November of 1999 and the Wenchuan MS8.0 earthquake, the distribution of the semi-annual number for ML≥3.0 earthquakes changes abnormally, and the distribution of the monthly number for ML≥2.0 earthquakes changes obviously prior to the Wenchuan MS8.0 earthquake.

Key words: Longmenshan fault, Seismic activity, Month-scale number, Characteristics of distribution

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