余震序列分维特征的初步探讨

PRELIMINARY STUDY ON FRACTAL FEATURES O(?)-AFTERSHOCK SEQUENCE

本文应用关联维数计算方法,分别计算了雷波5.4级地震、康定5.2级、5.8级地震和大邑6 1/4级地震的余震序列的关联维数D_2,并给出了相应的离差和相关系数。它们的关联维数分别为2.26982、1.93915、2.28738和1.5367。在这4个地震序列中,发生强余震的序列的D_2大于无强余震的序列。

This paper introduces a method calculating the relative fractal factor and has calculated the relative fractal factors(D_2)of after-shock sequences of the Leipo earthquake(Ms=5.4), two Kangding earthquakes(Ms=5.2, 5.8)and the Dayi earthquake(Ms=6(1/4)), using this method. The D_2 factors, for above mentioned four earthquakes, are 2.26982, 1.93915, 2.28738 and 1.5367 respectively. Relative coefficient and related departure of every D_2 are calculated and given. The D_2 factor of aftershock sequence in which the strong aftershock occurred is larger than that of aftershock sequence in which the strong aftershock did not occur.