罐罐岭断裂带最新活动特征
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摘要
断层的最新活动时代以及分段特征一直在重大工程安全性评价中具有特别重要的意义。在解决黄河黑山峡地震地质问题时,通过对罐罐岭断裂带的航片解译、野外追踪调查、地形地貌测量和古地震槽探资料研究,从而确定了该断裂带的活动时代以及分段特征。该断裂带发育在青藏块体东北缘,是中卫-同心弧形活动构造带的一部分,总体走向近EW,长约60km,分为5条不连续的次级断层,各段成左阶羽列,晚第四纪以来表现出强烈的左旋走滑兼挤压逆冲活动特征。断层错断了一系列山脊、小冲沟和阶地等,发育醒目的断层陡坎。研究发现,罐罐岭断裂最新一次地震破裂发生在距今700～1200a之间,最大同震位移位于罐罐岭附近,全新世以来水平左旋最大错距达6m。
The newest active time and segmentation of the fault are of special significance in the safety evaluation of major engineering projects.This paper discusses the active times and segmentation characteristics of the Guanguanling Fault zone through interpreting aerial photos,field investigation,topographic and geomorphic surveys and analysis of trench logs on paleoearthquake in connection with the study of the geological and seismologic problems in Heishanxia project of the Huanghe River.The Guanguanling active fault zone lies on the northeastern margin of the Qinghai-Tibet block.It is part of the Zhongwei-Tongxin arc active fault zone,striking near EW generally,with a total length of about 60km.It consists of 5 discontinuous secondary faults arranged in left step en echelon,namely,Jingtaixiaohongshan(F1-1),Guanguanling(F1-2),Shajing(F1-3),Zhongweixiaohongshan(F1-5)and Qingshan-Gushanzi(F1-4),respectively.Since Late Quaternary,the fault is characterized with intense sinistral strike-slip and compressional thrust and has offset a series of ridges and small gullies and terraces.At the same time,fault scarps were developed along the fault zone.The study reveals that the latest earthquake occurred 700～1200a BP,the largest displacement took place in Guanguanling,and the maximum horizontal sinistral displacement reaches 6m since Holocene.
The newest active time and segmentation of the fault are of special significance in the safety evaluation of major engineering projects.This paper discusses the active times and segmentation characteristics of the Guanguanling Fault zone through interpreting aerial photos,field investigation,topographic and geomorphic surveys and analysis of trench logs on paleoearthquake in connection with the study of the geological and seismologic problems in Heishanxia project of the Huanghe River.The Guanguanling active fault zone lies on the northeastern margin of the Qinghai-Tibet block.It is part of the Zhongwei-Tongxin arc active fault zone,striking near EW generally,with a total length of about 60km.It consists of 5 discontinuous secondary faults arranged in left step en echelon,namely,Jingtaixiaohongshan(F1-1),Guanguanling(F1-2),Shajing(F1-3),Zhongweixiaohongshan(F1-5)and Qingshan-Gushanzi(F1-4),respectively.Since Late Quaternary,the fault is characterized with intense sinistral strike-slip and compressional thrust and has offset a series of ridges and small gullies and terraces.At the same time,fault scarps were developed along the fault zone.The study reveals that the latest earthquake occurred 700～1200a BP,the largest displacement took place in Guanguanling,and the maximum horizontal sinistral displacement reaches 6m since Holocene.
引文
柴炽章,焦德成,廖玉华,等.2003.宁、蒙、甘交界罐罐岭发现地震地表破裂带[J].地震地质,25(1):167—168.CHAI Chi-zhang,JIAO De-cheng,LIAO Yu-hua,et al.2003.Dicovery of surface rupture zone produced by Guan-guanling earthquake at the juncture of Ningxia,Inner Mongolia and Gansu province[J].Seismology and Geolo-gy,25(1):167—168(in Chinese).
丁国瑜.1992.有关断层分段的一些问题[J].中国地震,8(2):1—10.DING Guo-yu.1992.Some discussions on fault segmentation[J].Earthquake Research in China,8(2):1—10(inChinese).
国家地震局“鄂尔多斯周缘活动断裂系”课题组.1988.鄂尔多斯周缘活动断裂系[M].北京:地震出版社.The Research Group on“Active Fault System around Ordos Massif”,SSB.1988.Active Fault System around OrdosMassif[M].Seismological Press,Beijing(in Chinese).
闵伟,张培震,邓起东.2001.中卫?同心断裂带全新世古地震研究[J].地震地质,23(3):357—366.MIN Wei,ZHANG Pei-zhen,DENG Qi-dong.2001.The study of Holocene paleoearthquakes on Zhongwei-TongxinFault zone[J].Seismology and Geology,23(3):357—366(in Chinese).
汪一鹏,宋方敏,李志义,等.1990.宁夏香山?天景山断裂带晚第四纪强震重复间隔的研究[J].中国地震,6(2):16—24.WANG Yi-peng,SONG Fang-min,LI Zhi-yi.1990.Study on recurrence intervals of great earthquakes in the lateQuaternary of Xiangshan-Tianjingshan fault zone in Ningxia[J].Earthquake Research in China,6(2):16—24(in Chinese).
张培震,毛凤英,常向东.1998.重大工程地震安全性评价中活动断裂分段的准则[J].地震地质,20(4):289—299.ZHANG Pei-zhen,MAO Feng-ying,CHANG Xiang-dong.1998.The criteria for active fault segmentation in seismicsafety assessment of major engineering[J].Seismology and Geology,20(4):289—299(in Chinese).
周俊喜,刘百篪.1987.中卫?同心活动断层研究[J].西北地震学报,9(3):71—77.ZHOU Jun-xi,LIUBai-chi.1987.The Research of Zhongwei-Tongxin Fault[J].Northwest Seismological Journal,9(3):71—77(in Chinese).
丁国瑜.1992.有关断层分段的一些问题[J].中国地震,8(2):1—10.DING Guo-yu.1992.Some discussions on fault segmentation[J].Earthquake Research in China,8(2):1—10(inChinese).
国家地震局“鄂尔多斯周缘活动断裂系”课题组.1988.鄂尔多斯周缘活动断裂系[M].北京:地震出版社.The Research Group on“Active Fault System around Ordos Massif”,SSB.1988.Active Fault System around OrdosMassif[M].Seismological Press,Beijing(in Chinese).
闵伟,张培震,邓起东.2001.中卫?同心断裂带全新世古地震研究[J].地震地质,23(3):357—366.MIN Wei,ZHANG Pei-zhen,DENG Qi-dong.2001.The study of Holocene paleoearthquakes on Zhongwei-TongxinFault zone[J].Seismology and Geology,23(3):357—366(in Chinese).
汪一鹏,宋方敏,李志义,等.1990.宁夏香山?天景山断裂带晚第四纪强震重复间隔的研究[J].中国地震,6(2):16—24.WANG Yi-peng,SONG Fang-min,LI Zhi-yi.1990.Study on recurrence intervals of great earthquakes in the lateQuaternary of Xiangshan-Tianjingshan fault zone in Ningxia[J].Earthquake Research in China,6(2):16—24(in Chinese).
张培震,毛凤英,常向东.1998.重大工程地震安全性评价中活动断裂分段的准则[J].地震地质,20(4):289—299.ZHANG Pei-zhen,MAO Feng-ying,CHANG Xiang-dong.1998.The criteria for active fault segmentation in seismicsafety assessment of major engineering[J].Seismology and Geology,20(4):289—299(in Chinese).
周俊喜,刘百篪.1987.中卫?同心活动断层研究[J].西北地震学报,9(3):71—77.ZHOU Jun-xi,LIUBai-chi.1987.The Research of Zhongwei-Tongxin Fault[J].Northwest Seismological Journal,9(3):71—77(in Chinese).
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