兰州马衔山-兴隆山活动断裂系的构造变形特征和机制

详细考察获得了兰州马衔山—兴隆山活动断裂系4条断裂的几何细结构、新活动性等定量资料。其中马衔山北缘断裂为一条规模大、活动性强的全新世逆左旋走滑断裂，而马衔山南缘断裂、兴隆山南缘断裂和兴隆山北缘断裂等其它3条断裂均为其伴生的逆断裂，为晚更新世活动断裂。它们在深部均可以归并到马衔山北缘断裂这一主走滑断裂带上，是兰州地区重要的控震断裂，影响和制约着本区的地震活动。

Tectonic Deformation Feature and Mechanism of the Maxianshan-Xinglongshan Active Fault System in the Lanzhou Area

Detail investigation have obtained the quantitative data about the geometrical structure,new activity,etc.in the four faults of the Maxianshan Xinglongshan active fault system.Among of them,the northern margin fault of Maxianshan is a left lateral reverse strike slip fault in Holocene with large scale and strong activity.The others are its concomitant faults,include the southern margin active fault zone of the Maxianshan Mountain,southern margin active fault zone of the Xinglongshan Mountain and the northern margin active fault zone of the Xinglongshan Mountain,they are thrust faults which active in early of late Pleistocene.It can be concluded to the major strike slip fault zone,the northern margin fault of the Maxianshan fault in depth.They are controlled earthquake structures,constrained and influence on the seismicity in the Lanzhou area.