龙门山映秀-北川断裂带擂鼓探槽剖面古地震事件测年
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摘要
2008年5月12日四川汶川发生MS8.0大地震,形成了200多km长的地震地表破裂带。破裂带的古地震研究对于认识龙门山断裂带的活动习性和大地震的发生规律具有重要的理论和现实意义。文中用光释光(OSL)测年中的校正感量简单多片再生法(SMAR),对映秀-北川地震地表破裂带擂鼓探槽样品进行了光释光测年,并对探槽中含有的炭屑进行了AMS14C测年。样品的光释光年龄和校正的AMS14C年龄吻合,该地区与汶川地震类似规模的上一次古地震事件发生在距今约(2.1±0.2)ka至(1.1±0.2)ka间。
Paleoseismic studies conducted along the surface rupture of the Wenchuan earthquake(MS 8.0)of 12th May 2008 provide important information regarding earthquake reoccurrence intervals and slip rates of the Longmen Shan Fault zone.The Leigu trench was excavated along the middle segment of the surface rupture of the Yingxiu-Beichuan Fault zone.Based on the syntectonic sedimentary structure,two earthquake events,including the Wenchuan event,were identified at this site.This study utilizes Optically Stimulated Luminescence(OSL)dating of samples collected from the Leigu trench section,using SMAR(Sensitivity-corrected Multiple Aliquot Regenerative-dose)protocols.AMS14 C dating was also carried out on charcoal from the same sediments.OSL ages are generally consistent with the calibrated AMS14 C ages(cal a BP)for the same units.The penultimate earthquake event similar to Wenchuan earthquake scale in this region occurred(2.1±0.2)ka to(1.1±0.2)ka.
Paleoseismic studies conducted along the surface rupture of the Wenchuan earthquake(MS 8.0)of 12th May 2008 provide important information regarding earthquake reoccurrence intervals and slip rates of the Longmen Shan Fault zone.The Leigu trench was excavated along the middle segment of the surface rupture of the Yingxiu-Beichuan Fault zone.Based on the syntectonic sedimentary structure,two earthquake events,including the Wenchuan event,were identified at this site.This study utilizes Optically Stimulated Luminescence(OSL)dating of samples collected from the Leigu trench section,using SMAR(Sensitivity-corrected Multiple Aliquot Regenerative-dose)protocols.AMS14 C dating was also carried out on charcoal from the same sediments.OSL ages are generally consistent with the calibrated AMS14 C ages(cal a BP)for the same units.The penultimate earthquake event similar to Wenchuan earthquake scale in this region occurred(2.1±0.2)ka to(1.1±0.2)ka.
引文
冉勇康,陈立春,陈桂华,等.2008.汶川MS8.0地震发震断裂大地震原地重复现象初析[J].地震地质,30(3):630—643.RAN Yong-kang,CHEN Li-chun,CHEN Gui-hua,et al.2008.Primary analyses of in situ recurrence of large earth-quake along seismogenic fault of WenchuanMS8.0earthquake[J].Seismology and Geology,30(3):630—643(in Chinese).
徐锡伟,闻学泽,叶建青,等.2008.汶川MS8.0地震地表破裂及其发震构造[J].地震地质,30(3):597—629.XUXi-wei,WEN Xue-ze,YE Jian-qing,et al.2008.TheMS8.0Wenchuan earthquake surface ruptures and its seis-mogenic structure[J].Seismology and Geology,30(3):597—629(in Chinese).
闻学泽,张培震,杜方,等.2009.2008年汶川8.0级地震发生的历史与现今地震活动背景[J].地球物理学报,52(2):444—454.WEN Xue-ze,ZHAGN Pei-zheng,DU Fang,et al.2009.The background of historical and modern seismic activities ofthe occurrence of the2008MS8.0Wenchuan,Sichuan,earthquake[J].Chinese Journal of Geophysics,52(2):444—454(in Chinese).
王旭龙,卢演俦,李晓妮.2005.细颗粒石英光释光测年:简单多片再生法[J].地震地质,27(4):615—623.WANG Xu-long,LUYan-chou,LI Xiao-ni.2005.Luminescence dating of fine-grained quartz in Chinese loess:Simpli-fied multiple aliquot regenerative-dose(MAR)protocol[J].Seismology and Geology,27(4):615—623(in Chi-nese).
王同利,陈杰,杨传成,等.2005.Daybreak厚源α-计数仪的标定计测量影响因素的初步研究[J].地震地质,27(4):633—644.WANG Tong-li,CHEN Jie,YANG Chuan-cheng,et al.2005.Calibration of daybreak thick source alpha counter andpreliminary study of influencing factors[J].Seismology and Geology,27(4):633—644(in Chinese).
张培震,徐锡伟,闻学泽,等.2008.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,51(4):1066—1073.ZHAGN Pei-zheng,XUXi-wei,WEN Xue-ze,et al.2008.Slip rates and recurrence intervals of the Longmen Shan ac-tive fault zone,and tectonic implications for the mechanism of the May12Wenchuan earthquake,2008,Sichuan,China[J].Chinese Journal of Geophysics,51(4):1066—1073(in Chinese).
Aitken M J.1998.An introduction to Optical Dating[M].Oxford University Press,Oxford.39—50.
Burchfiel B C,Royden L H,Van der Hilst R D,et al.2008.A geological and geophysical context for the Wenchuanearthquake of12May2008,Sichuan,People s Republic of China[J].GSA Today,18(7):4—11.
Duller G A T.2003.Distinguishing quartz and feldspar in single grain luminescence measurements[J].RadiationMeasurements,37:161—165.
Jacobs Z,Wintle A G,Duller G A T.2006.Evaluation of SAR procedures for De determination using single aliquots ofquartz from two archaeological sites in South Africa[J].Radiation Measurements,41(5):520—533.
Lu Y C,Wang X L,Wintle AG.2007.AnewOSLchronology for dust accumulation in the last130,000yr for the Chi-nese Loess Plateau[J].Quaternary Research,67:152—160.
Murray A S,Wintle A G.2000.Luminescence dating of quartz using an improved single-aliquot regenerative-dose pro-tocol[J].Radiation Measurements,32(1):57—73.
Murray A S,Wintle A G.2003.The single aliquot regenerative dose protocol:Potential for improvements in reliability[J].Radiation Measurements,37:377—381.
Rees-Jones J.1995.Optical dating of young sediments using fine-grain quartz[J].Ancient TL,13(2):9—14.
Stuiver M,Reimer P J,Bard E,et al.1998.INTCAL98radiocarbon age calibration24000～0cal BP[J].Radiocar-bon,40:1041—1083.
Wintle AG,Murray AS.2006.Areviewof quartz optically stimulated luminescence characteristics and their relevancein single-aliquot regeneration dating protocols[J].Radiation Measurements,41(4):369—391.
徐锡伟,闻学泽,叶建青,等.2008.汶川MS8.0地震地表破裂及其发震构造[J].地震地质,30(3):597—629.XUXi-wei,WEN Xue-ze,YE Jian-qing,et al.2008.TheMS8.0Wenchuan earthquake surface ruptures and its seis-mogenic structure[J].Seismology and Geology,30(3):597—629(in Chinese).
闻学泽,张培震,杜方,等.2009.2008年汶川8.0级地震发生的历史与现今地震活动背景[J].地球物理学报,52(2):444—454.WEN Xue-ze,ZHAGN Pei-zheng,DU Fang,et al.2009.The background of historical and modern seismic activities ofthe occurrence of the2008MS8.0Wenchuan,Sichuan,earthquake[J].Chinese Journal of Geophysics,52(2):444—454(in Chinese).
王旭龙,卢演俦,李晓妮.2005.细颗粒石英光释光测年:简单多片再生法[J].地震地质,27(4):615—623.WANG Xu-long,LUYan-chou,LI Xiao-ni.2005.Luminescence dating of fine-grained quartz in Chinese loess:Simpli-fied multiple aliquot regenerative-dose(MAR)protocol[J].Seismology and Geology,27(4):615—623(in Chi-nese).
王同利,陈杰,杨传成,等.2005.Daybreak厚源α-计数仪的标定计测量影响因素的初步研究[J].地震地质,27(4):633—644.WANG Tong-li,CHEN Jie,YANG Chuan-cheng,et al.2005.Calibration of daybreak thick source alpha counter andpreliminary study of influencing factors[J].Seismology and Geology,27(4):633—644(in Chinese).
张培震,徐锡伟,闻学泽,等.2008.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,51(4):1066—1073.ZHAGN Pei-zheng,XUXi-wei,WEN Xue-ze,et al.2008.Slip rates and recurrence intervals of the Longmen Shan ac-tive fault zone,and tectonic implications for the mechanism of the May12Wenchuan earthquake,2008,Sichuan,China[J].Chinese Journal of Geophysics,51(4):1066—1073(in Chinese).
Aitken M J.1998.An introduction to Optical Dating[M].Oxford University Press,Oxford.39—50.
Burchfiel B C,Royden L H,Van der Hilst R D,et al.2008.A geological and geophysical context for the Wenchuanearthquake of12May2008,Sichuan,People s Republic of China[J].GSA Today,18(7):4—11.
Duller G A T.2003.Distinguishing quartz and feldspar in single grain luminescence measurements[J].RadiationMeasurements,37:161—165.
Jacobs Z,Wintle A G,Duller G A T.2006.Evaluation of SAR procedures for De determination using single aliquots ofquartz from two archaeological sites in South Africa[J].Radiation Measurements,41(5):520—533.
Lu Y C,Wang X L,Wintle AG.2007.AnewOSLchronology for dust accumulation in the last130,000yr for the Chi-nese Loess Plateau[J].Quaternary Research,67:152—160.
Murray A S,Wintle A G.2000.Luminescence dating of quartz using an improved single-aliquot regenerative-dose pro-tocol[J].Radiation Measurements,32(1):57—73.
Murray A S,Wintle A G.2003.The single aliquot regenerative dose protocol:Potential for improvements in reliability[J].Radiation Measurements,37:377—381.
Rees-Jones J.1995.Optical dating of young sediments using fine-grain quartz[J].Ancient TL,13(2):9—14.
Stuiver M,Reimer P J,Bard E,et al.1998.INTCAL98radiocarbon age calibration24000～0cal BP[J].Radiocar-bon,40:1041—1083.
Wintle AG,Murray AS.2006.Areviewof quartz optically stimulated luminescence characteristics and their relevancein single-aliquot regeneration dating protocols[J].Radiation Measurements,41(4):369—391.
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