湖北襄樊-广济断裂第四纪活动特征初步探讨
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摘要
利用近年在襄樊-广济断裂研究中获得的有关资料,对该断裂第四纪以来的活动特征进行了初步分析,认为断裂3个几何段自第四纪以来均有不同程度的活动,断层切割地貌面、断层带物质的TL、ESR法年龄结果多集中分布在700～300ka之间(平均值约500ka),说明襄樊-广济断裂在第四纪中更新世早中期有过明显活动。历史及现今地震活动图像显示,断裂带附近地震活动呈现沿断裂走向自北西向南东逐渐增强的特点,这与断裂3个几何段的分段活动性基本一致。时间上,该断裂带上地震活动的强度、频度呈增强的趋势。
In recent years,some data have been obtained about the Quaternary activity of Xiangfan-Guangji fault belt.These data suggest that three geometric segments of the fault are characterized by various activities since Quaternary.The TL and ESR dating of fault gouge ranges from 700 ka to 300 ka(averaging 500 ka),which suggests that the fault should have undergone intense activities during the Early and Middle Pleistocene Epoch.The historical and present seismic activity image illustrates that,seismic activity neighbouring the fault belt is gradually increased from NW toward SE,and this is favourably consistent with the activity of three fault segments themselves.In temporal,the strength and frequency of seismic activity have an increasingly enhanced trend.
In recent years,some data have been obtained about the Quaternary activity of Xiangfan-Guangji fault belt.These data suggest that three geometric segments of the fault are characterized by various activities since Quaternary.The TL and ESR dating of fault gouge ranges from 700 ka to 300 ka(averaging 500 ka),which suggests that the fault should have undergone intense activities during the Early and Middle Pleistocene Epoch.The historical and present seismic activity image illustrates that,seismic activity neighbouring the fault belt is gradually increased from NW toward SE,and this is favourably consistent with the activity of three fault segments themselves.In temporal,the strength and frequency of seismic activity have an increasingly enhanced trend.
引文
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[2]邓乾忠,彭练红,陈林.襄樊-广济断裂构造地质特征及发展演化[J].资源环境与工程,2004,18(增刊):17-22.
[3]陈璘.襄樊-广济断裂湖北段构造特征研究[J].石油实验地质,2009,31(2):186-191.
[4]袁学诚,任纪舜,徐明才,等.东秦岭邓县—南漳反射地震剖面及其构造意义[J].中国地震,2002,29(2):14-18.
[5]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001.
[6]甘家思,申重阳,姚运生.襄樊-广济断裂带武汉段和黄州段第四纪活动的初步研究[C]∥佚名.中国地震学会第八次学术大会论文摘要集.北京:地震出版社,2000:60.
[7]邓起东,卢造勋,杨主恩.城市活动断层探测和断层活动性评价问题[J].地震地质,2007,29(2):189-200.
[8]湖北省地质矿产局.湖北省区域地质志[M].北京:地质出版社,1990.
[9]王云安,刘章捷.武汉阳逻长江大桥水域工程地震勘探[J].地球科学:中国地质大学学报,2001,26(4):388-390.
[10]长江勘测规划设计研究有限责任公司.黄冈—大冶天然气输气管道工程长江穿越隧道工程地质勘察报告[R].武汉:长江勘测规划设计研究有限公司,2009.
[11]中国地震局地质研究所.湖北省拟建核电站候选厂址地震调查及其安全性评价报告[R].武汉:武汉地震地质研究所,2004.
[12]中国地震局地质研究所,武汉地震工程研究院.湖北省浠水核电厂址地震地质调查与地震安全性评价报告[R].武汉:武汉地震工程研究院,2006.
[13]Rink W J.Electron spin resonance(ESR)dating and ESR ap-plications in Quaternary science and Archaeometry[J].RadMeasure,1997,27(5/6):975-1025.
[14]Grun R.Present status of ESR dating[J].Apll.Radiat.Isot.,1989,40:1045-1056.
[15]Fukuchi T.ESR studies for absolute dating of fault movement[J].J.Geol.Soc.,1989,149:265-272.
[16]Aitken M J.Thermoluminescence dating[M].London:Aca-demic Press,1985.
[17]Stokes S.Luminescence dating applications in geomorphologi-cal research[J].Geomorphology,1999,29:153-171.
[18]国家地震局震害防御司.中国历史强震目录[M].北京:地震出版社,1995.
[19]熊继平.湖北地震史料汇考[M].北京:地震出版社,1986.
[20]吕坚,郑勇,倪四道,等.2005年11月26日九江-瑞昌Ms5.7、Ms 4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164.
[21]LüJian,Zhang Yong,Ni Sidao,et al.Focal mechanisms andseismogenic structures of the Ms5.7 and Ms4.8 JiujiangRuichang earthquakes of Nov.26,2005[J].Chinese Journalof Geophysics,2008,51(1):158-164.
[22]王墩,肖和平,姚运生,等.九江-瑞昌地震序列的构造背景与发震构造探讨[J].大地测量与地球动力学,2007,27(专刊):15-20.
[23]吴海波,姚运生,薛军蓉.汶川地震对湖北地震活动趋势的影响[J].大地测量与地球动力学,2009,29(增刊):59-65.
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