兰州马衔山北缘断裂中段晚第四纪活动的新证据
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摘要
马衔山北缘断裂为兰州市区南侧一条规模较大的区域性活动断裂带,总体走向N60°W,长约115km。该断裂大致可划分为4条次级断裂段,自东向西分别为内官营段、马衔山段、七道梁段和雾宿山段。其中,内官营段为晚更新世活动段,雾宿山段为全新世活动段并为1125年兰州7级地震的发震断裂,而中间的马衔山段和七道梁段以往研究所获得的新活动证据不多,认识不统一。近期经过详细的追踪考察,获得了马衔山段和七道梁段晚第四纪活动的新证据,结合该区多次历史地震的活动特征,表明其为晚第四纪活动断裂,具左旋走滑兼倾滑运动特征。
In the southern mountainous region of Lanzhou city,there are four large-scale regional active fault zones of late Quaternary.These are the northern margin fault of Maxian Shan("Shan" means Mountain)(F1),the southern margin fault of Maxian Shan(F2),the southern margin fault of Xinglong Shan(F3),and the northern margin fault of Xinglong Shan(F4).They make up the Maxian Shan-Xinglong Shan active fault system.The northern margin fault of Maxian Shan is the longest among them.The fault's eastern end begins in Neiguanying,moves along Miaowan,Yangzhai,and Yinshan,then meets with the southern margin fault of Xinglong Shan in Moyunguan of Qidaoliang and continues along Tianjiagou,Hutan,Guanshan,Xianshuigou,and the western part ends in Bapanxia,Yellow River.The fault strike direction is about N60 °W and the total fault length is about 115 km. The geometrical features of the northern margin fault of Maxian Shan are simple.The fault is divided into four segments according to the fault displacement,fault bending,fault step,and differences in recent activity.The secondary faults are the Neiguanying segment(F1-1),the Maxian Shan segment(F1-2),the Qidaoliang segment(F1-3),and the Wusu Shan segment(F1-4).Field investigations indicate that the northern margin fault of Maxian Shan is a seismic fault zone characterized by segmentation.Its eastern segment,the Neiguanying secondary fault,is a late Pleistocene fault.The west segment,the Wusushan secondary fault,is active in the Holocene and produced the Lanzhou M7 earthquake.However,there is no geological and dating evidence for the recent activity of the middle segments,that is,the Maxian Shan and Qidaoliang secondary faults.Nonetheless,in recent years,field investigations have indicated that the middle segments were active during the late Pleistocene and early Holocene,on the basis of left-lateral strike-slip and dip-slip features. According to historical data in the Lanzhou area,several moderate to strong earthquakes with magnitude of about 5~6 occurred in the Maxian Shan area in 1524,1629,and 1901 A.D.besides the Lanzhou M7 earthquake in 1125 A.D.and Yongjing M6.5 earthquake in 1590 A.D.These earthquakes may have correlated with the activity of the northern margin fault of Maxian Shan. The northern margin fault of Maxian Shan was active in late Quaternary and produced several moderate to strong or even large historical earthquakes;therefore,this fault is active and has the potential to produce earthquakes in future.
引文
[1]袁道阳,雷中生,刘百篪,等.兰州1125年7级地震考证与发震构造分析[J].中国地震,2002,18(1):67-75.YUAN Dao-yang,LEI Zhong-sheng,LIU Bai-chi,et al.Ex-amination of Historical Data of the 1125Lanzhou M7.0Earth-quake and Analysis of Seismogenic Structure[J].EarthquakeResearch in China,2002,18(1):67-75.
    [2]国家地震局兰州地震研究所,甘肃省计划委员会.甘肃省地震危险区划研究[M].兰州:兰州大学出版社,1993.Lanzhou Institute of Seismology,CSB,Planning Committee ofGansu Province.Research on the seismic risk zoning in Gansuprovince[M].Lanzhou:Lanzhou University Press,1993.
    [3]袁道阳,刘百篪,才树华,等.兰州马衔山北缘断裂带的新活动特征研究[J].地震地质,2002,24(3):315-323.YUAN Dao-yang,LIU Bai-chi,CAI Shu-hua,et al.PrincipalFeatures of Recentof the Active Northern Marginal Fault ofMaxianshan Mountains,Lanzhou,Gansu Province[J].Seis-mology and Geology,24(3):315-323.
    [4]宋方敏,袁道阳,陈桂华,等.甘肃马衔山北缘断裂西北段几何结构及其新活动[J].地震地质,2006,28(4):547-560.SONG Fang-min,YUAN Dao-yang,CHEN Gui-hua,et al.Geometric Structures and Recent Activity Along the North-west Segment of North Marginal Fault of MaxianshanMountains,Gansu Province[J].Seismology and Geology,2006,28(4):547-560.
    [5]宋方敏,袁道阳,陈桂华,等.1125年兰州7级地震地表破裂类型及其分布特征[J].地震地质,2007,29(4):834-844.SONG Fang-min,YUAN Dao-yang,CHEN Gui-hua,et al.Pattern and Combination Features of the Surface Ruptures ofthe 1125A.D.Lanzhou M7Earthquake[J].Seismology andGeology,2007,29(4):834-844.
    [6]袁道阳,刘小凤,郑文俊,等.兰州马衔山—兴隆山活动断裂系的新构造变形特征和机制[J].中国地震,2003,19(2):125-131.YUAN Dao-yang,LIU Xiao-feng,ZHENG Wen-jun,et al.Tectonic Deformation Feature and Mechanism of the Maxians-han-Xinglongshan Active Fault System in the Lanzhou Area[J].Earthquake Research in China,2003,19(2):125-131.
    [7]袁道阳,刘小凤,郑文俊,等.兰州地区活动构造格架与变形特征[J].地质学报,2004,78(5):626-632.YUAN Dao-yang,LIU Xiao-feng,ZHENG Wen-jun,et al.Active Tectonic Framework and Deformation Features inLanzhou Area[J].Acta Geologica Sinica,2004,78(5):626-632.
    [8]袁道阳,雷中生,张俊玲,等.1590年7月7日甘肃永靖东南地震考证[J].震灾防御技术,2007,2(2):158-165.YUAN Dao-yang,LEI Zhong-sheng,ZHANG Jun-ling,et al.Textual Research on the Southeastern of Yongjing Earthquakein Gansu Province on July 7,1590A.D.[J].Technology forEarthquake Disaster Prevention,2007,2(2):158-165.
    [9]谢毓寿,蔡美彪主编.中国地震历史资料汇编(第一卷)[M].北京:科学出版社,1983.XIE Yu-shou,CAI Mei-biao.Summary of the Chinese Histor-ical Earthquake Records(no1)[M].Beijing:Science Press,1983.
    [10]国家地震局兰州地震研究所.陕甘宁青四省(区)强地震目录[M].西安:陕西科技出版社,1985.Lanzhou Institute of Seismology,SSB.Catalogue of Shanxi,Gansu,Ningxia and Qinghai Four Provinces or MunicipalityStrong Earthquakes[M]..Xi′an:Shanxi Scientific and Tech-nological Press,1985.
    [11]国家地震局兰州地震研究所.甘肃省地震资料汇编[M].北京:地震出版社,1989.Lanzhou Institute of Seismology,SSB.Summary of the Gansuhistorical earthquake records[M].Beijing:Seismologicalpress(in Chinese),1989.
    [12]袁道阳,王兰民,何文贵,等.兰州市地震活断层探测新进展[J].地震地质,2008,30(1):236-249.YUAN Dao-yang,WANG Lan-min,HE Wen-gui,et al.New Progress of Seismic Active Fault Prospecting in LanzhouCity[J].Seismology and Geology,2008,30(1):236-249.
    [13]史志刚,雷中生,袁道阳,等.1306年宁夏固原地震考证与发震构造探讨[J].西北地震学报,2011,33(1):342-348.SHI Zhi-gang,LEI Zhong-sheng,YUAN Dao-yang,et al.Textural Research on the Guyuan Earthquake in 1306inNingxia Region,and Discussion on Its Seismogenic Structure[J].Northwestern Seismological Journal,2011,33(4):342-348.
    [14]刘兴旺,雷中生,袁道阳,等.1609年甘肃红崖堡7级地震考证[J].西北地震学报,2011,33(2):143-148.LIU Xing-wang,LEI Zhong-sheng,YUAN Dao-yang,et al.Textural Research on the Hongyapu M7Earthquake in1609[J].Northwestern Seismological Journal,2011,33(2):143-148.
    [15]雷中生,袁道阳,郑文俊,等.756年张掖—酒泉地震考[J].西北地震学报,2012,34(1):72-77.LEI Zhong-sheng,YUAN Dao-yang,ZHENG Wen-jun,etal.Textural Research of Zhangye-Jiuquan Earthquake in756A.D.[J].Northwestern Seismological Journal,2012,34(1):72-77.

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