榆木山北缘断裂古地震特征研究
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摘要
榆木山北缘断裂位于祁连山主体山系以北的榆木山北部边缘。断裂活动形成一系列沿山前发育的断层陡坎。通过探槽剖面对发生在该断裂带上的古地震事件进行了分析,大致可以确定全新世以来的2次古地震事件。事件Ⅰ的年代为距今(4.066±0.086)ka;事件Ⅱ为距今(6.852±0.102)ka至(6.107±0.082)ka之间。该断裂的最后一次古地震事件发生在距今(4.066±0.086)ka,并非公元180年表氏71/2级地震的发震断裂。
The northern Yumushan Fault located on the northern flank of Qilian fold system is an active fault in Holocene.The fault is about 60km long,trending NWW.It is a trust fault with left-lateral strike-slip component.The activity of the fault produced a series of scarps along the mountain front.The fault zone is divided into three segments,and the middle part is the most active.In this paper,palaeo-earthquake events on the fault are studied.With the study of trench profiles,two palaeo-earthquake events are determined.Event I occurred at 4.066±0.086kaBP,and event II is between 6.852±0.102kaBP and 6.107±0.082ka BP.The last palaeo-earthquake event on this fault occurred in 4.066±0.086kaBP.So,the northern Yumushan Fault is not the seismogenic fault of the M 71/2 Biaoshi earthquake of 180 AD.The elapse time from the latest event has been 4000yr,so the possibility of generating destructive earthquake in future should be recognized sufficiently.
The northern Yumushan Fault located on the northern flank of Qilian fold system is an active fault in Holocene.The fault is about 60km long,trending NWW.It is a trust fault with left-lateral strike-slip component.The activity of the fault produced a series of scarps along the mountain front.The fault zone is divided into three segments,and the middle part is the most active.In this paper,palaeo-earthquake events on the fault are studied.With the study of trench profiles,two palaeo-earthquake events are determined.Event I occurred at 4.066±0.086kaBP,and event II is between 6.852±0.102kaBP and 6.107±0.082ka BP.The last palaeo-earthquake event on this fault occurred in 4.066±0.086kaBP.So,the northern Yumushan Fault is not the seismogenic fault of the M 71/2 Biaoshi earthquake of 180 AD.The elapse time from the latest event has been 4000yr,so the possibility of generating destructive earthquake in future should be recognized sufficiently.
引文
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李玉龙,邢成起.1988.河西走廊地质构造基本特征以及榆木山北麓与黑河口上龙王活断层研究[J].西北地震学报,10(2):35—47.LI Yu-long,XING Cheng-qi.1988.Research on the fundamental characteristics of the geological structures of the HexiCorridor and the active faults of the northern and eastern flank of the Yumushan Mountain[J].Northwestern Seismological Journal,10(2):35—47(in Chinese).
郑文俊.2009.河西走廊及其邻区活动构造图像及构造变形模式[D]:[学位论文].北京:中国地震局地质研究所.9—140.ZHENG Wen-jun.2009.Geometric pattern and active tectonics of the Hexi Corridor and its adjacent regions[D].Ph DThesis.Institute of Geology,China Earthquake Administration,Beijing.9—140(in Chinese).
郑文俊,张培震,袁道阳,等.2009.甘肃高台合黎山南缘发现地震地表破裂带[J].地震地质,31(2):247—255.ZHENG Wen-jun,ZHANG Pei-zhen,YUAN Dao-yang,et al.2009.Discovery of surface rupture zone on the south ofHelishan in Gaotai,Gansu Province[J].Seismology and Geology,31(2):247—255(in Chinese).
Tapponnier P,Meyer B,Avouac J P,et al.1990.Active thrusting and folding in the Qilian Shan,and decoupling betweenupper crust and mantle in northeastern Tibet[J].Earth and Planetary Science Letters,97:382—403.
陈柏林,王春宇,宫红良,等.2007.关于河西走廊盆地榆木山北缘断裂晚第四纪活动特征的新认识[J].地质通报,26(8):976—983.CHEN Bo-lin,WANG Chun-yu,GONG Hong-liang,et al.2007.A new understanding of the characteristics of Late Quaternary activity of the northern Yumushan marginal fault in the Hexi corridor,northwestern China[J].GeologicalBulletin of China,26(8):976—983(in Chinese).
虢顺民,陈志泰,向光中,等.1991.甘肃高台榆木山地区晚新生代活动断裂和断层陡坎[A].见:国家地震局地质研究所编.现代地壳运动研究(5).北京:地震出版社.146—153.GUO Shun-min,CHEN Zhi-tai,XIANG Guang-zhong,et al.1991.Late Cenozoic active faults and fault scarps in the Yumushan area,Gaotai,Gansu,China[A].In:Institute of Geology,SSB(ed).Modern Crustal Movement(5).Seismological Press,Beijing.146—153(in Chinese).
国家地震局地质研究所,国家地震局兰州地震研究所.1993.祁连山-河西走廊活动断裂系[M].北京:地震出版社.88—91,193—197.Institute of Geology State Seismogical Bureau and Lanzhou Institute of Seismology of State Seismogical Bureau.1993.The Qilian Mountains-Hexi Corridor Active Fault System[M].Seismological Press,Beijing.88—91,193—197(inChinese).
李玉龙,邢成起.1988.河西走廊地质构造基本特征以及榆木山北麓与黑河口上龙王活断层研究[J].西北地震学报,10(2):35—47.LI Yu-long,XING Cheng-qi.1988.Research on the fundamental characteristics of the geological structures of the HexiCorridor and the active faults of the northern and eastern flank of the Yumushan Mountain[J].Northwestern Seismological Journal,10(2):35—47(in Chinese).
郑文俊.2009.河西走廊及其邻区活动构造图像及构造变形模式[D]:[学位论文].北京:中国地震局地质研究所.9—140.ZHENG Wen-jun.2009.Geometric pattern and active tectonics of the Hexi Corridor and its adjacent regions[D].Ph DThesis.Institute of Geology,China Earthquake Administration,Beijing.9—140(in Chinese).
郑文俊,张培震,袁道阳,等.2009.甘肃高台合黎山南缘发现地震地表破裂带[J].地震地质,31(2):247—255.ZHENG Wen-jun,ZHANG Pei-zhen,YUAN Dao-yang,et al.2009.Discovery of surface rupture zone on the south ofHelishan in Gaotai,Gansu Province[J].Seismology and Geology,31(2):247—255(in Chinese).
Tapponnier P,Meyer B,Avouac J P,et al.1990.Active thrusting and folding in the Qilian Shan,and decoupling betweenupper crust and mantle in northeastern Tibet[J].Earth and Planetary Science Letters,97:382—403.
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