图9  大同-阳高地震余震震中分布（a）及其深度剖面图（1989．10．18～12．5）

Fig. 9  （a）Epicentral distribution of the aftershocks of the

            Datong-Yanggao earthquake

        （b）Profiles of the focal depth of the events in the

             Datong-Yanggao earthquake sequence