合浦-北流断裂带西支合浦盆地段断裂活动性研究
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摘要
合浦-北流断裂起于北部湾海域,经合浦、博白后继续向NE延伸,断裂总长度为400余千米,断裂总体走向为40°～60°,分东、西2支,其中西支自南流江下游合浦盆地西南段一直向NE延伸。文中主要采用地质地貌、地震探测、钻探以及年代学方法,对合浦-北流断裂西支合浦盆地段的活动性进行判定,结果表明:合浦-北流断裂西支合浦盆地段最后1次活动应发生在早更新世中晚期,错距约为10m,断裂被中更新世中、晚期地层覆盖,即中更新世中、晚期以来,断裂的活动趋于减弱或停止。
Hepu-Beiliu Fault starts from Beibuwan sea area in the southwest,extends northeastwards continually though Hepu,Bobai. The total length of the fault exceeds 400 kilometers and the general strike of the fault is 40°～60°. The Hepu-Beiliu Fault comprises two branches-the east branch and the west branch. The west branch stretches from the southwest of the Hepu Basin lying in the lower reaches of the Nanliu River towards the northeast. This paper discusses the activity of the fault segment in the Hepu Basin in the west branch of Hepu-Beiliu Fault from the following three aspects. Firstly,in view of the geological topography,fault-scarps develop widely in the Hepu Basin segment of the west branch and the linear feature of the scarp distribution is notable; Secondly,some exact locations that the fault crosses are investigated by high-resolution seismic reflection profiling; Finally,in order to evaluate the activity and their times of the Hepu Basin segment of the Hepu-Beiliu Fault,borehole drilling is carried out to find out the dislocated stratum of the fault and take samples for laboratory dating to define the latest activity time of the fault. Based on the fault chronology results,the latest active era of this segment(the Hepu Basin segment of the Hepu-Beiliu Fault)is concluded in the late era of the lower Pleistocene. The fault slip displacement is about 10 meters. This fault is covered by the strata of the middle to upper of mid-Pleistocene,which means that the activity level of this segment became lower,or it has been inactive since the late eva of mid-Pleistocene.
Hepu-Beiliu Fault starts from Beibuwan sea area in the southwest,extends northeastwards continually though Hepu,Bobai. The total length of the fault exceeds 400 kilometers and the general strike of the fault is 40°～60°. The Hepu-Beiliu Fault comprises two branches-the east branch and the west branch. The west branch stretches from the southwest of the Hepu Basin lying in the lower reaches of the Nanliu River towards the northeast. This paper discusses the activity of the fault segment in the Hepu Basin in the west branch of Hepu-Beiliu Fault from the following three aspects. Firstly,in view of the geological topography,fault-scarps develop widely in the Hepu Basin segment of the west branch and the linear feature of the scarp distribution is notable; Secondly,some exact locations that the fault crosses are investigated by high-resolution seismic reflection profiling; Finally,in order to evaluate the activity and their times of the Hepu Basin segment of the Hepu-Beiliu Fault,borehole drilling is carried out to find out the dislocated stratum of the fault and take samples for laboratory dating to define the latest activity time of the fault. Based on the fault chronology results,the latest active era of this segment(the Hepu Basin segment of the Hepu-Beiliu Fault)is concluded in the late era of the lower Pleistocene. The fault slip displacement is about 10 meters. This fault is covered by the strata of the middle to upper of mid-Pleistocene,which means that the activity level of this segment became lower,or it has been inactive since the late eva of mid-Pleistocene.
引文
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[1]江苏省工程物理勘察院,2008,广西防城港核电厂工程可行性研究阶段隐伏断裂勘测专题:浅层地震勘探成果报告。
[1]同474页[1]。
[1]中国地震局地质研究所,2008,广西防城港核电厂工程可行性研究阶段地震安全性评价报告。
[1]同474页[1]。
[1]同474页[1]
[1]同474页[1]。
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邓起东,卢造勋,杨主恩.2007.城市活动断层探测和断层活动性评价问题[J].地震地质,29(1):194—198.DENG Qi-dong,LU Zao-xun,YANG Zhu-en.2007.Remarks on urban active faults exploration and associated activityassessment[J].Seismology and Geology,29(1):194—198(in Chinese).
广西壮族自治区地质矿产局.1985.广西壮族自治区区域地质志[M].北京:地质出版社.Guangxi Bureau of Geology and Mineral Resources.1985.Regional Geology of Guangxi Zhuang Autonomous Region[M].Geological Publishing House,Beijing(in Chinese).
汪一鹏,曹忠权,宋方敏,等.1996.合浦断裂第四纪活动性初步研究[A].见:国家地震局地质研究所编.活动断裂研究(5).北京:地震出版社.189—196.WANG Yi-peng,CAO Zhong-quan,SONG Fang-min,et al.1996.Apreliminary study on the activity of the Hepu Faultduring the Quaternary[A].In:Institute of Geology,SSB(ed).Active Fault Research(5).Seismological Press,Beijing.189—196(in Chinese).
中国地震局震害防御司.1999.中国近代地震目录(公元1912—1990MS≥4.7)[Z].北京:地震出版社.Department of Earthquake Disaster Prevention,SSB.1999.Catalogue of the Modern Earthquakes of China(1912-1990MS≥4.7)[Z].Seismological Press,Beijing(in Chinese).
周本刚,杨晓平,杜龙.2008.广西防城-灵山断裂带活动性分段与潜在震源区划分研究[J].震灾防御技术,3(1):8—18.ZHOU Ben-gang,YANG Xiao-ping,DU Long.2008.Discussion on the segmentation of Fangcheng-Lingshan Fault,Guangxi and determination of related potential seismic sources[J].Technology for Earthquake Disaster Preven-tion,3(1):8—18(in Chinese).
[1]江苏省工程物理勘察院,2008,广西防城港核电厂工程可行性研究阶段隐伏断裂勘测专题:浅层地震勘探成果报告。
[1]同474页[1]。
[1]中国地震局地质研究所,2008,广西防城港核电厂工程可行性研究阶段地震安全性评价报告。
[1]同474页[1]。
[1]同474页[1]
[1]同474页[1]。
同474页[1]。
[1]同476页[1]。
陈国达.1939.广东灵山地震志[J].两广地质调查所特刊第17号.CHEN Guo-da.1939.Seismic chronicles of Lingshan in Guangdong Province[J].Special issue No.17of GeologicalSurvey Institute of Guangdong and Guangxi Provinces(in Chinese).
邓起东,卢造勋,杨主恩.2007.城市活动断层探测和断层活动性评价问题[J].地震地质,29(1):194—198.DENG Qi-dong,LU Zao-xun,YANG Zhu-en.2007.Remarks on urban active faults exploration and associated activityassessment[J].Seismology and Geology,29(1):194—198(in Chinese).
广西壮族自治区地质矿产局.1985.广西壮族自治区区域地质志[M].北京:地质出版社.Guangxi Bureau of Geology and Mineral Resources.1985.Regional Geology of Guangxi Zhuang Autonomous Region[M].Geological Publishing House,Beijing(in Chinese).
汪一鹏,曹忠权,宋方敏,等.1996.合浦断裂第四纪活动性初步研究[A].见:国家地震局地质研究所编.活动断裂研究(5).北京:地震出版社.189—196.WANG Yi-peng,CAO Zhong-quan,SONG Fang-min,et al.1996.Apreliminary study on the activity of the Hepu Faultduring the Quaternary[A].In:Institute of Geology,SSB(ed).Active Fault Research(5).Seismological Press,Beijing.189—196(in Chinese).
中国地震局震害防御司.1999.中国近代地震目录(公元1912—1990MS≥4.7)[Z].北京:地震出版社.Department of Earthquake Disaster Prevention,SSB.1999.Catalogue of the Modern Earthquakes of China(1912-1990MS≥4.7)[Z].Seismological Press,Beijing(in Chinese).
周本刚,杨晓平,杜龙.2008.广西防城-灵山断裂带活动性分段与潜在震源区划分研究[J].震灾防御技术,3(1):8—18.ZHOU Ben-gang,YANG Xiao-ping,DU Long.2008.Discussion on the segmentation of Fangcheng-Lingshan Fault,Guangxi and determination of related potential seismic sources[J].Technology for Earthquake Disaster Preven-tion,3(1):8—18(in Chinese).
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