图11 滇中地区（a）ML2.5～4.9级和震中周围地区（b）ML 2.0～4.9级地震月频度曲线

图11 滇中地区（a）M_L2.5～4.9级和震中周围地区（b）M_L 2.0～4.9级地震月频度曲线

Fig.11 Curve of monthly frequency of M_L2.5～4.9 earthquakes in the central part of

Yunnan Province (a) and M_L2.0～4.9 earthquakes around the epicentral area (b)