大同盆地西侧北北东－北东向鹅毛口－口泉断裂，属正平移性质，晚第四纪以来断裂继续活动，但北东、南西两段活动有明显差异。盆地东侧北东－北东东向六棱山北麓断裂，亦属正断层性质，至今仍在活动。距大同二电厂扩建厂址最近的水峪断裂，晚更新世末３～１．５万年以来已停止活动，对厂址稳定性不会有影响。 The North-East-North-East goosehead-mouth spring fault on the west side of the Datong Basin belongs to a positive-transgressing character. The faults have continued to move since the late Quaternary, but there are obvious differences in the activities between the north east and the south west. The north-east-northeast-east part of the basin to the north of the Liulishan fault is also of normal fault type and still active. The water valley fracture closest to the expansion site of Datong-II power plant has been suspended for 3-15,000 years since the end of Late Pleistocene, and will not affect the stability of the site.