龙门山断裂带地震活动的月尺度频度分布特征

Abstract

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 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 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 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.

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

CLC Number:

P315.7

CHEN Xue-zhong, GUO Xiang-yun, LI Yan-e. Distribution Characteristics of the Month-scale Number for Earthquakes Occurred on the Longmenshan Fault[J]. EARTHQUAKE, 2010, 30(2): 20-28.

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

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