图1  华北断块区新生代和现代活动性构造与震中分布图^［1］

Fig.1  Cenozoic and modern active tectonics of Northern China fault block area and

       epicenter distribution of historic earthquakes

       1.华北断块区边界断裂；   2.次级断块边界断裂；   3.重要的大断裂;

       地震震中:  4. M≥8.0; 5. M=7.0-7.9; 6. M=6.0-6.9; 7. M=5.0-5.9