图1  五原地区地质构造及历史地震震中分布图

Fig.1  Geologic structure in Wuyuan region and epicentral distribution

       of historical earthquakes

       ①杭锦后－五原断裂 ②五原西侧断裂 ③狼山－色尔腾山山前断裂 ④乌拉山北侧断裂