图8  龙南地震序列频度衰减曲线^[5]

Fig.8  Frequency attenuation curves for the events of the M_S 5.0  

       Longnan earthquake sequence

       (a) 为频度分布图(M_L≥1.0, ∑N_k=269);  (b) 为频度衰减图(M_L≥1.3)