【摘要】 对历史地震资料的详细考证、黄土地震滑坡的调查及兰州地区活动断裂的追踪考察表明 :在兰州 112 5年地震中遭毁坏的“金城六城”之一的益机滩堡在今兰州市西固区河口以南的维尼龙厂内 ,由此确定的六城范围在今兰州市西固区以南至河口一带。这与本区黄土地震滑坡的分布范围、全新世活动断裂的展布及地震破裂带遗迹的分布相吻合。综合分析认为 ,兰州112 5年 7级地震的发震构造应为兰州市区以南、距市区最近距离仅 4km的马衔山北缘活动断裂带西端的咸水沟断裂段更多还原

【Abstract】 There was a great earthquake happened in Lanzhou city with magnitude about 7.0 on August 30,1125 AD, caused 6 towns damaged in Jingcheng (Lanzhou) during that earthquake. According to the detail textual research on the historical earthquake references, the distribution of loess earthquake landslides and compare to the activities of all the active fault zones in Lanzhou area. The central area of the 1125 Lanzhou M7.0 earthquake is in the area from south of Xigu to Hekou. It is consistent with the area of ancient towns distribution, loess landslides distribution, Holocene active fault and the earthquake rupture zone. Comprehensive analysis indicate that the causative structure of the 1125 Lanzhou M7.0 earthquake is in the west segment of the northern margin of Maxianshan Mt. active fault zone. It is the new activity of this fault caused the great earthquake.更多还原