延怀盆地隐伏断裂第四纪活动性研究
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摘要
依据盆地第四系沉积特点,结合高密度、CSAMT(可控源音频大地电磁)、浅层地震及钻孔磁化率探测结果,剖析隐伏断裂在盆地的几何形态特征及活动性。结果表明:延矾盆地北缘断裂南段(隐伏端)沿窑湾村-桑园南堡村展布,由2条SE倾的阶梯状正断层组成,切割第四系上更新统泥河湾组地层,上断点埋深40m,断距约35m;断裂在早-中更新世有过活动,晚更新世断裂活动性较强,全新世以后断裂活动性具逐渐减弱趋势;施庄断裂北隐伏段经施庄向SE145°方向展布,切割第四系泥河湾组地层,上断点埋深70m,断裂早-中更新世有过活动,晚更新世断裂活动性较强。综合分析认为,延怀盆地隐伏断裂在晚更新世时期活动性强,而全新世以来,各断裂活动性减弱。
In this paper,we analyze the activity of the buried fault in Yanfan basin on basis of the sedimentary characteristics of Quaternary,combining the results of the multi-electrode resistivity,CSAMT,shallow earthquake and Drilling magnetic susceptibility The results show that the south section of north margin fault of Yanfan basin(buried)extend along Yaowan-Sangyuannanbao village,it consists of two SE tendency step-shaped normal faults and cuts the Nihewan stratum of Quaternary upper Pleistocene.The depth of upper break point is 40 m,and breaking distance is 35 m.It is shown that the activity of the early-middle Pleistocene was active and became stronger in the late Pleistocene.After the Holocene the activity of faults gradually decreased.The buried north section of Shizhuang fault distribute in the SE145°direction,and also cut Nihewan stratum and the depth of upper break point is 70 m,its activity has been high in the early-middle Pleistocene,and become higher in the late Pleistocene.Comprehensive analysis indicate that the buried faults of Yanhuai basin are very active in the late Pleistocene,and then become weaker since the Holocene.
In this paper,we analyze the activity of the buried fault in Yanfan basin on basis of the sedimentary characteristics of Quaternary,combining the results of the multi-electrode resistivity,CSAMT,shallow earthquake and Drilling magnetic susceptibility The results show that the south section of north margin fault of Yanfan basin(buried)extend along Yaowan-Sangyuannanbao village,it consists of two SE tendency step-shaped normal faults and cuts the Nihewan stratum of Quaternary upper Pleistocene.The depth of upper break point is 40 m,and breaking distance is 35 m.It is shown that the activity of the early-middle Pleistocene was active and became stronger in the late Pleistocene.After the Holocene the activity of faults gradually decreased.The buried north section of Shizhuang fault distribute in the SE145°direction,and also cut Nihewan stratum and the depth of upper break point is 70 m,its activity has been high in the early-middle Pleistocene,and become higher in the late Pleistocene.Comprehensive analysis indicate that the buried faults of Yanhuai basin are very active in the late Pleistocene,and then become weaker since the Holocene.
引文
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[10]张素欣,王晓山,王想,等.2016年1月9日怀来震群序列震兆意义综合分析[J].华北地震科学,2016,34(3):32-36.
[11]谭毅培,曹井泉,刘文兵,等.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析[J].地球物理学报,2014,57(6):1847-1856.
[2]冉勇康,方仲景,段瑞涛,等.河北矾山盆地北缘断层八营段的古地震重复模型[J].中国地震,1998,14(1):47-58.
[3]于贵华,徐锡伟,马文涛,等.延矾盆地北缘断裂深浅构造关系研究[J].地震学报,2004,26(1):68-76.
[4]高文学,马瑾.首都圈地震地质环境与地震灾害[M].北京:地震出版社,1993.
[5]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社,2002.
[6]谢富仁,张红艳,崔效峰,等.延怀盆地活动断裂运动与现代构造应力场[J].地震地质,2007,29(4):693-705.
[7]戚帮申.张家口地区地壳稳定性研究[D].北京:中国地质科学院,2017.
[8]盛艳蕊,张子广,周晓成,等.新保安—沙城断裂带土壤气地球化学特征分析[J].地震,2015,35(4):90-98.
[9]朱海生,赵赪民,李广辉,等.延怀盆地构造特征及未来地震危险性评价[J].华北地震科学,2006,24(1):38-42.
[10]张素欣,王晓山,王想,等.2016年1月9日怀来震群序列震兆意义综合分析[J].华北地震科学,2016,34(3):32-36.
[11]谭毅培,曹井泉,刘文兵,等.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析[J].地球物理学报,2014,57(6):1847-1856.