图17  溧阳6.0级地震前中小地震震中分布图

Fig.17  Epicentral distribution of the moderate and small earthquakes

        before the M6.0 Liyang earthquake

        (a) M_S≥3.0级地震震中分布图(1975－1979); (b)  溧阳两次中强地震前的地震空区