兰州马衔山-兴隆山活动断裂系的构造变形特征和机制
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摘要
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。
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.
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.
引文
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吕鸿图、仵慧宁,1992,兰州河谷盆地性质及其成因研究,兰州大学学报,28(1),102～108。
王民新、吕鸿图,1985,兰州地区主要构造形迹与新构造应力场特征探讨,兰州大学学报,21(2),91～96。
袁道阳、刘百篪、才树华等,2002a,兰州马衔山北缘断裂带的新活动特征研究,地震地质,21(1),15～23。
袁道阳、贾亚会、才树华等,2002b,兰州马衔山北缘断裂带古地震初步研究,西北地震学报,24(1),199～205。
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朱俊杰、曹继秀、钟巍等,1995,兰州地区黄河最高阶地与最老黄土沉积的发现及其古地磁年代学研究,青藏高原形成演化、环境变迁与生态系统研究,77～90,北京:科学出版社。
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